Murderous Plants? Save Your Garden From Sabotage
HTML-код
- Опубликовано: 28 сен 2024
- Wondering why your garden just isn't thriving? It could be being sabotaged...by other plants! Join Hank Green to improve your green thumb and learn which kinds of plants do NOT get along in a harmonious garden!
SciShow is on TikTok! Check us out at / scishow
----------
Support SciShow by becoming a patron on Patreon: / scishow
----------
Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever:
Matt Curls, Alisa Sherbow, Dr. Melvin Sanicas, Harrison Mills, Adam Brainard, Chris Peters, charles george, Piya Shedden, Alex Hackman, Christopher R, Boucher, Jeffrey Mckishen, Ash, Silas Emrys, Eric Jensen, Kevin Bealer, Jason A Saslow, Tom Mosner, Tomás Lagos González, Jacob, Christoph Schwanke, Sam Lutfi, Bryan Cloer
----------
Looking for SciShow elsewhere on the internet?
SciShow Tangents Podcast: scishow-tangen...
Facebook: / scishow
Twitter: / scishow
Instagram: / thescishow
#SciShow #science #education
----------
Sources:
dergipark.org....
www.extension....
www.frontiersi...
doi.org/10.102...
jem-online.org...
www.cabdirect....
www.mdpi.com/1...
www.gettyimage...
commons.wikime...
www.gettyimage...
www.gettyimage...
www.gettyimage...
commons.wikime...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
www.gettyimage...
These Plants Poison The Competition
Check out rocketmoney.com/scishow to start managing your personal finances today. Thank you to Rocket Money for sponsoring today's video! #rocketmoney #personalfinance]
Actually we can manage weeds several better methods than using synthetic chemical inputs.
Using livestock to control both pests and weeds, improving soil health through polycultures, and growing plants that respond well to the local biomes rids farmers and ranchers of the need to use expensive synthetic inputs entirely. Mark Shepard has his home base farm, plus a bunch more he in developing in nearby states that are doing well.
Btw we've known about the chemical juglone for quite a while.
Johnson grass is a problematic relative of sorghum as cold weather causes it to be poisonous to livestock.
Scotch broom is another plant that uses allelopathy.
Calling Pliny the Elder just a naturalist is falling short, but I like him being mentioned.
Plants compete wow like any Gardner would know this.
Also why the hell does nobody grow native fruits there delicious and becoming more rare please grow native ones.
i had rocket money and they charged me for a premium subscription without my consent
@@thesilentone4024
Mark Shepard/Restoration Agriculture uses a the natural biome as a basis for what he grows, they outcompete the weeds and then he uses livestock to manage pests and the few weeds that are a bother. The livestock also add fertility. A really nice side benefit includes really healthy, flavorful meats are produced and totally avoids CAFOs/monocropping/bare, dead fields (fallow) and soil loss/irrigation/synthetic chemical inputs. He produces a lot more calories and nutrition per acre than his neighbors while greatly reducing costs. His has a lot more economic resilience than his neighbors. His home base is in Wisconsin or Minnesota, I believe, though he is also working on developing several other farms in nearby states.
Black walnut (juglans nigra) is an american species, so Pliny couldn't have observed it. He was observing another walnut tree, a closely related english walnut, juglans regia (though it does not come from England, despite the name). Although the black walnut produces more of the juglone than english walnut, as far as I'm aware
This
Yeah something seemed off there
Ahh i just wrote a comment about this and its great that others notice tis
By contrast carrots boost tomato growth. Another common vegetable always stunts the growth of tomatoes near it, Kale. I've learned that one from personal experience. Two or three years in a row I had tomatoes refuse to grow when planted in the same bed/shrub pot as kale. Good to know that not everything bows to black walnut trees though.
Someone must have forgotten to tell my tomatoes, which are growing well with Kale
Both kale and tomatoes are heavy feeders, I bet the kale simply overpowered the tomatoes in that regard.
That's called companion planting. In permaculture you see of lot of 'guilds' -that are essentially plantings of mutually beneficial plants...
Kale requires a lot of nitrogen, since you're primarily growing it for the leaves. Tomatoes also require lots of nitrogen, but only during the first phase of their lives. After that, you want to scale back the nitrogen and give them phosphorous to encourage flowering and fruit development. Otherwise tomatoes given too much nitrogen will bush out with lots of leafy growth and very few flowers. So it might actually be okay to plant kale next to mature tomatoes, as long as the tomatoes don't shade it out. There is another consideration though, which is that tomatoes and other nightshades tend to prefer acidic soil, whereas kale and other brassicas prefer more neutral soil.
@@volz4103 Companion plants
An old gardener saying about generally putting a garden near a walnut tree is "a hundred yards or a hundred years". First, clearly distance, but the second is that even over decades, a big, old, walnut even years after it has died has invested the surrounding soil so thoroughly with juglone that its effects are still in play.
You can mulch an entire 50ft walnut tree into your garden in the fall and by spring there will be 0 juglone remaining. Anyone who tells you otherwise is wrong.
@@SergeantDude well that’s because walnut mulch stays on top of the soil and the juglone will break down over time. If a walnut tree grew in the area, the juglone will have built up over a long period of time and be a higher concentration, along with being deeper in the soil where it’s protected from the environment
@@samreid6010 what gives you the courage to just make stuff up? Juglone is READILY degraded by bacteria.Some can even survive solely on juglone on the roots of mature trees. Science has disagreed with gardeners on this for 70 years and it's sad to see scishow parroting this crap.
@@SergeantDude B.S. we have large black walnut trees and after 20 years from being cut down, NO fruiting tree can survive in its former canopy ground area. Sumac loves it tho
@@samreid6010 indeed. We had a compost pile under a walnut tree and the compost killed tomatoes and other plants
When I was a kid my grandparents had a farm with two huge, old trees, one on either side of the property. One was an oak tree, but the other was a 40 or so year old black walnut tree. I always wondered why the entire area around that huge tree was practically barren!
Juglone am I right
Probably was also because they are big trres that creat lots of shade, and have a big dense root systems that out compete other plants for water and nutrients. Pines do the same, and they dont produce jugolone...
@@srantoniomatos I remembered that pine needles have alot of tannin and resins which is quite toxic to other plants and also alter the soil pH to make the soil more suitable for them.
@@minhducnguyen9276 yeah..maybe a bit too, of that. Not much tho. Belive pine needles only make the soil more acidic in great quantities usually bog places, very rainy places. Otherwise is jusl a small layer of dry mulch that dosent affect soil ph. The density of pine roots arround the upper layers of soil inibites lots of plants, due to lack of moist, anyway, lots of small bushes grow around a pine if it have space enough, because its a great place for bidrs go eat the seeds...
@@srantoniomatos I learned that pine forests tend to have less smaller plants because the needles are harder to decompose which makes it harder to hold water and the grass will also have harder time punching through the thick needles to get to the surface or the soil below. But I don't know how much the tanin and the pH change contribute to the suppression of other plants.
I like how the title went from the rather neutral "Plants that poison the competition" to the absolute news headline of a news article "Plants will absolutely murder each other"
I bet the views went up significantly because of it.
It's pretty common for the title to change. Sometimes it starts as clickbait and gets normal and sometimes it's the opposite. I've been hoping we'll see some data from that one day.
Changing the video title multiple times is the new meta of getting more views. And with this video it's completely true that plants do murder each other.
RUclips. Gotta entice the clicks. It's a part of the game.
I would have clicked regardless of which title, it’s just that it showed up in recommendations with the current one
This kind of complex interaction between nature and agriculture is really fascinating at the same time it boggles my mind.
Agriculture IS part of nature.
Technology IS part of nature.
This was new to me. Allelochemicals.....are plant wars.
Also, Hank Green and the whole Scishow team is THE BEST! Keep up your good work!
I learned something new about sorghum. Decades ago I learned about its behavior of producing hydrocyanic acid if it wilts such as from frost damage, which was something we carefully had to watch as we had one year of adding Sudax (hybrid Sorghum and Sudan Grass, which also has the behavior) as a crop on my father's dairy farm in Pennsylvania.
You must mean Pliny the Elder and English (aka Persian) Walnuts. Black Walnuts were native to Eastern North America and weren't introduced to Europe until the 1600s.
Where as Persian walnut (juglans regia) was a favorite of the Romans and was spread throughout their sphere of influence. Yeah, I was ready to jump on that too. You beat me to it!
My pet rabbit when I was 8 had musk thistle as its favorite treat lol
When growing up, a PSII issue also reduced my ability to thrive outside.
I'm so glad to see someone else thought of this joke.
Bruh...
Tekken II was my bff
I always wondered why my great grandfather dumped walnut husks on his muskmelon hills. now I know.
Hickory trees do emit juglone, but not as much as grandma's black walnut trees. She moved into a brand new house and she planted two black walnut trees. The one bordering her driveway and next to her neighbor's property killed her neighbor's privet hedge. My neighbor's hickory tree is close to my property and my tomatoes and peppers take a hit when they are rotated there. The hickory is in soil with a pH of 8.0, alkaline, and that stress seems to up the dosage of juglone. Hickory likes a pH of 6 to 7, slightly acid. However hickory does grow here and they turn yellow and drop their leaves earlier than the other types of non-native trees here. Denver east of the North Platte was treeless plain. Onions, beans and garlic do well in the same spot. However, Summer Girl tomatoes seems to have a tolerance to juglone and early blight, a disease more common to gardeners today. The two extra plants near the hickory did as well as those in the main part of the garden this year until frost. The two other varieties wilted and died in July.
LOL, now THAT'S a great secondary title for yer episode: "The Cereal Killers!" 😆
Actually we can manage weeds with several better methods than using synthetic chemical inputs.
Using livestock to control both pests and weeds, improving soil health through polycultures, and growing plants that respond well to the local biomes rids farmers and ranchers of the need to use expensive synthetic inputs entirely. Mark Shepard has his home base farm, plus a bunch more he in developing in nearby states that are doing well.
Btw we've known about the chemical juglone for quite a while.
Johnson grass is a problematic relative of sorghum as cold weather causes it to be poisonous to livestock.
Scotch broom is another plant that uses allelopathy.
I mean, yeah. But that's ignoring the fact that industrial farms will absolutely not want to do that bc profits, and that we depend on those farms for food. And even if we did switch, it would need to be carefully done bc smthn could easily go wrong. And if it goes wrong, we're easily screwed.
@@StonedtotheBones13
Exactly. While permaculture/restoration ag techniques are profitable in and of themselves, they lack the value added effects that bad ag bring. Human and livestock maladies, pollution, soil degradation, food vulnerability, etc now require techniques, inputs, treatments, etc that keep us in a cycle of extra dependency on the corporate conglomerates...
Yass! We need to manage this one world we have kn a much better way if we want to stick around!
@@StonedtotheBones13 Agriculture is heavily subsidised in the cast majority of developed economies - change the system of subsidies and give farmers a fair chance and agriculture will follow along - very quickly too I bet!
Hank pronouncing Pliny like it rhymes with Viney when everyone else says it rhyming with Vinny really throw me for a loop
totally! It was so unexpected and so cute!
I've never heard it pronounced to rhyme with Vinny.
Where I am from, everyone says it Plee-nyush
Good thing I watched the whole video, I was thinking for most of it "why don't we try to use these chemicals to replace harmful herbicide". But that was answered at the end. lol
Sunflowers are also plant killers, however, I still like to have them near my veggie garden. I just make sure that the would-be-victim plants are in a raised bed so their soil isn’t effected. And the sunflowers can then become a bug trap, attracting pests that would normally go after the tender veggies
Interesting. My family used to grow a garden every year, and our tomato plants never seemed to survive long enough to grow tomatoes (which is a bummer because I love tomatoes). We live right against some woods, and it includes black walnut trees. We noticed how our tomato plants did better after the county came and cut down the trees nearest my house by a good 20 yards to protect my neighborhood from falling trees. My parents always assumed they just finally got the right fertilizer and watering schedule figured out.
a small FYI is that flour from sorghum is a common ingredient in "gluten-free" flour.
Garlic mustard (alliaria petiolata) has roots that release chemical that mess with neighboring plants by altering the network of fungi in the area.
Interesting. Guess stinging nettle isn't bothered by it, had a patch of garlic mustard that gave way to stinging nettle, both were tasty.
There’s a good attenborough clip somewhere on youtube where a water lilly just obliterates all the other plants around it
Walnut shavings & sawdust is considered very bad for horse bedding too!
@wdwerker, Interesting. Why is that? What happens if you use walnut shavings as bedding a stall? Is there some reaction with horse urine?
@@fredericapanon207 I think horses are just sensitive to compounds in the wood. I’ve seen it mentioned many times over the years in woodworking publications. I don’t know much about horses besides them being expensive to keep.
My nearby black walnut tree has a lot of wild basil and garlic mustard growing near it
Hie just want to say I love your content , your talks on Umwelt and Allelopathy are so far my favorite … keep the good work going
Invasive mustards here in SoCal, USA can be a problem- their allochemistry can hinder the growth of native plants.
Musk Thistles die after flowering? You've never seen them in a pasture, have you? If so, they regenerate like a Phoenix every year.
Sure as he'll, they don't die here in the States where they are invasive! I've seen them taller than I am, and thick as a man's wrist. That is each stalk of them. The rosette will often send out many stalks.
That Only happens after years.
I like how I'm hearing from people near me learn new things about black walnut trees, and I'm like yep I know, we're surrounded by them remember, lol.
The thistle is easier to deal with than another yet much more thorny plant. I've been doing research over the past couple years, getting info from the conservation department, botanists, etc, and putting our black walnuts, husks too, through some tests.
One test I did 3yrs ago, was to tackle an invasive plant that likes to take over the ground in the woods. It usually sends roots out every 10ft-20ft where you'll then see another one poking from the ground. If left alone, it'll grow into one big thorny bush so to speak. Wildlife hate it, from turkeys, deer, coyotes, raccoons, rabbits, and even mice. I was told by the Missouri department, there's only 2 options to remove the invasive plant: control burn, or pull every single one during winter.
But, black walnuts is your best option!
What I did was collect walnuts when they were getting black spots and felt kinda squishy. They can't be black and dried up or it won't work. You need the inside between the husk & nut to still have it's moisture. I used a 5g bucket and filled it up, but about ⅓ of the bucket filled with water. You want the husks to be able to be at the point they come off easy from the shells.
*make sure to wear clothing or outerwear you don't mind staining or throwing away. Those latex/non latex gloves ain't gonna help you in this, get some long dishwashing gloves. *wear disposable gloves within, just in case.
I had plastic type slip on garden shoes, and they are permenantly stained, that's how strong that black juice is gonna be!
Soaking time varies. You're looking for when the husks come off easy.
*The shells get taken out btw.
Prior to dumping the mix onto the invasive plant, the plant gets cut down as low as possible to the ground, and holes poked toward its roots. Then pour the black water mix on it.
I will say the grass around it was affected but came back last year.
*Sorry, forgot name of plant. Comment to remind me to tell you.
Kudzu maybe?? It's a beast!
Btw, the recipe you described matches up with one that some survivalist-types have used for illegal applications. We didn't have this conversation, k.
@@timapple6586 I'm good with what I've been working on. Nothing illegal, unless I was to go on someone else's property without their knowledge. And we've got black walnut trees mixed in the woods with other trees close together. There are grasses and flowers that can do fine near a black walnut tree, even within 5ft.
I will back up what was said tho in the video about certain produce won't do well or even grow near a black walnut tree. I lost several seed packs attempting to see what would grow in my garden spaces. Cherry tomatoes I can't say for certain because of the extreme dry heat we had during summer. Poor little tomatoes were getting burned this year.
Besides certain plants that don't do well from black walnuts, I'm curious why 2 times I found newts in the walnut pile around a tree. We don't have a pond or lake near, a creek is well down the road tho. The creek is usually dried up.
It just seemed like an odd thing to happen, twice we know of.
What does the plant look like? It it viney or shrubby?
You can make a powerful clothes dye from black walnut husks. Again, be careful of staining. They’ll dye your skin just as readily.
Where does the Lilac bush fall in this subject? I’ve always heard that the roots suppressed other plants.
The sources used in this video are listed in the description and I've yet to find one that explains how Pliny could have known anything about Black Walnut. Many here have already pointed out the incongruities and I've gone back just to confirm what Hank actually said. It appears that Pliny may simply have been one of the (or the) first people to document the observed effects of allelopathy and apparently it was an observation involving chick peas. It looks like either his researchers or his script writers may have let Hank down on this one.
Probably going to be one of those videos where a correction/retraction is due.
He was observing an english walnut, juglans regia (although despite the name it does not originate from England, anywhere close from it to be honest). It is a closely related species to black walnut (juglans nigra). Both of them are very similar, but black walnut produces more of the juglone from what I know
I thought that the Black Walnut was a native tree to the Americas so Pliny would not have seen one.
@@broccanmacronain457 Thanks for explaining that... again.
Our property is full of black walnut trees and not knowing about black walnut toxicity, I put a garden in a spot surrounded by them and used mulch containing some leaves and any tomatoes I ever plant there will grow great for a while, then start to wither and wilt. The only thing that really grows decently in that spot is zucchini and that didn't even do well this year. In the front yard away from the BW trees, in large pots and a raised bed the tomatoes and peppers grow great.
Organic farmers can use the allelopathy of plants like sorghum and rye as a form of weed suppression by growing them as a cover crop. Instead of harvesting the plants for food, they incorporate them into the soil and as they break down they release their allelochemicals and prevent weed seed germination. The crops planted after that are either chosen for their innate resistance to the allelochemical or the crop seeds are protected by virtue of tending to be my larger than weed seeds. The effect often isn’t huge, but it is appreciable and is an ongoing area of research.
Sorghum (as a green manure) is mostly used for biomass and to release cyanide into the soil to kill nematodes. I wasn't aware that anyone used it to exert selection pressure on subsequent plants.
Sorgoleone has a very appropriate mafia-like sound to it.
It took me a while to notice.
CEREAL killer
OMG
Pliny the Elder could not have talked about the black walnut, Juglans nigra, because that tree is native to North America, not Europe or Africa. There are different walnut trees native to Europe that he must have been referring to. 1:00
My Playstation 2 always did this weird thing where it inhibits the transportation of electrons that are necessary for photosynthesis 🤔
Very interesting. Great. I just started gardening this past summer and will plant more next spring.
I did a whole thesis on allelopathy, and I've been pronouncing it wrong for two years 😂 Thanks Hank!
I guess it's a matter of dialect - usually Hank and his crew on PBS Eons (awesome yt channel - I love i) are pretty much the golden standard when it comes to American pronunciation, but they're not shy to point out that they make decisions when it comes pronunciation. Or if they occasionally actually get it wrong - I think dialects enrich a language!
I use the word occasionally at work and almost always drop that third “L”. Nobody seems to notice because they all do it too.
Perennial hardy geranium puts out a lot of allopathic substances. I removed it from a bed, not even mint or crab grass would grow in the bed this whole year, hopefully it will dissipate over the winter.
My favorite trees to climb growing up were known poisoners of other plants
The native juniper in the Southwest supresses many plants. I mulch them with nuisance plants like tumbleweeds, because no shed seeds will grow. It's an effective way to prevent the spread of the seeds.
e
I have a chokeberry in front of the house, and the dwarf Japanese red maple I planted next to it is growing like it’s recoiling in horror. I suspect allelopathy now. I am planning to remove the chokeberry and replace with goldspire gingko…that is, after a little research.
How Pliny the Elder, who lived in Italy during the Roman Empire and died in 79 AD, noticed that black walnut trees (Juglans nigra), that are native to North America, "tend not to have many leafy neighbours", when continental North America is credited to have been "discovered" (intending its presence acknowledged to Europeans) by Giovanni Caboto only in 1497? Is this finally a proof of time travelling?
Pliney The Elder could not have known about black walnut or Juglans nigra without visiting North America well before the first Europeans.
There are several other walnuts native to Eurasia that share the same chemicals though.
I have observed an interaction of Eucalyptus, probably grandis, and the surrounding soybean field similar to black walnut and tomatoes
Brazilian peppertrees which are a very invasive in Florida, are allelopathic.
Morning Glories just reached out and physically strangled my Stargazer Lily. I'm going to have to get some of these poisoner plants. They seem so much more sophisticated.
Thistles are utter a-holes when they're in the "rosette" stage, running about on grass barefoot as a kid, you found them soon enough, and because they grow so flat, the mower just skims right over them too... :S
Used to live on a farm and we had a black walnut tree that stood solitary in the middle of an old pig stye
Just because nature made it doesn't mean it's safer! It's natural it can't hurt me, but the more options we have the better off we will be.
Very true! Black Walnut juice can be a skin irritant as it grows; a concentrate of the active chemicals ... is not something I want to touch
Wow! Thank you!
Could this be used as a weed killer in any instance? I'm really sorry if this is stupid to ask.
Good question.
@@PeterParker-fx9dl Haha, thank you. I get scared to ask questions here because everyone is so smart.
There is no such thing as a stupid question. Especially not this one! The answer is yes, as long as the weeds you want to eradicate are sensitive to juglone. The problem might be getting it deep enough into the soil to suppress that year's growth. If you're using something like shredded hulls, and are using enough of them, I guarantee that you will have no healthy volunteer tomato weeds in that area the next year...or the next decade. =D
@@anne-droid7739 Wow, thank you! I have anything but a green thumb. I just can't keep plants alive... You sound like you could write a book on the topic, though.
One of the ways to guess if something is sensitive to juglone is to look at whether it is a plant that evolved in the same space. For instance, many woodland plants do just fine under black walnut trees. Violets thrive there, at least in my area. Grass grows well, and creeping charlie. So quite a few of the things we want to limit in a dedicated garden space are not affected.
The dad joke never fails to crack me up.
My uncle once told me about how he shredded some black walnut saplings and used them to mulch his garden. I laughed and asked him how long it took his garden to die.
He only made that mistake once.
I knew the word Allelopathy from the game Path of Exile. I knew it had something to do with Poison, but now I know more.
dont know quite why, but black walnut tree's are also lethal to horses
PS2 interfering with photosynthesis is pretty accurate.
I think myself and many other certain medical history podcast listners would disagree with your pronunciation of our old friend Pliny the elder. But it's great to see him either way!
Always interesting, thank you.
I'm very thankful and I appreciate that the name of this compound is Juglone.
The Sorgone😂
SORGOLEON?! are they inventing words?
Oh wait.. they are
Catechin is boring. Let's edit them so they stop synthesizing this compound
This words are so funny ahahah. Cucuber is funny too but native English speaker may not agree(?)(cause like it the normal)
Oh, I should probably apologize to my neighbour then, I suspected him of killing my flowers when I saw him spray herbicides in my garden.
Turns out it was a Walnut tree! There aren't any in the neighbourhood so it means there's definitely a hidden tree killing my plants somewhere beneath my house!
They'll kill apples within 10m and stunt them within 15, so they certainly have a reach.
I feel like if you plant your tomatoes next to a known-to-poison-the-earth tree, it is kinda reflective on your gardening skills.
To be fair, gardening is a learning process 😎
@@itsohaya4096 totally! We all start somewhere! I'm from Greenland - horticulture isn't very big in the high Arctic and there are two kinds of shrubs that go for being trees 🤭
@@jakobraahauge7299 I bet indoor growing is more common?
Walnut and other trees have root systems that can reach three times the distance from the edge of their canopies. New gardeners can be forgiven their mistakes when dealing with unseen circumstances.
I was thinking that too ...
Hi Hank!
I believe the herbicide discover is derived allopathic aspect of rye
Very interesting 🤔 Thank you 😊🌷👍
Why don't we figure out a way to create an organic herbicide from this plant or genetically modify our food crops to contain this within the roots to supress weeds.
That's exactly what some researchers are trying to do and not only that, we've already been doing it for a long time. Read about straw mulching.
nice! Eucalyptus is also known to kill whatever is around it
By its title, I thought this video would be about plants that I could use to poison my competition.
Does this make me a bad person?
Not if your competition are assholes.
The most famous RUclips commenter.
Only if you get caught.😁
Yes. Do you care? 😉
Juglans nigra is North American. Pliny the Elder never saw one. He was probably talking about regular Persian walnuts, known to the Romans.
did anyone else eat those purple things as a kid? they are sweet!
you mean tomatoes? oh boy
I think they mean the thistle flowers?
I was at a conference listening to a lecture about 50 years of research on the succession of a meadow, during the Q&A allelopathy was brought up. The scientist doing the research said many pioneer plants in the meadow, those that first colonized the abandoned farmland, were allelopathic.
I am a hardcore plant nerd and professional horticulturist. I make landscape architects look normal.
Cool thanks
So now we know that if we mix up a nice big concentrated batch of those few types plant chemicals we could drop them on an area to pretty much stop any plant growth in that area for a while. No more weeds in the cracks of your sidewalk. Or no more giant fields of some crop in an enemy nation.
Ailanthone!
In some parts of Africa sorghum is intercropped with cowpeas
Like we do corn and soybeans. That is probably done for nitrogen fixation from the cowpeas.
The Black Walnut killing your tomatoes with Juglone is probably kind of nonsense. Juglone absolutely does kill plants in large amounts, but Black Walnut trees only have one way that puts Juglone into the ground directly. Instead, they put Hydrojuglone into the ground, which is the reduced form of Juglone through leaf litter and hulls. Experimentally, there has been no difference in the amount of Juglone in the ground around black walnut trees depending on the time of year, indicating that the decomposition of the leaf litter and hulls does not deposit a significant amount of Juglone into the ground. The roots of a Black Walnut do however put a consistent amount of juglone into the ground year round, but there isn't any experimental evidence of this ever reaching phytotoxic levels. It is actually quite likely that Black walnuts kill with a cocktail of allelopathic compounds (flavonoids, terpenoids, alkaloids, etc.) and do not rely on Juglone alone to do it.
I would recommend listening to the field guides podcast episode on them for a more holistic look at black walnuts. Episode in question: www.thefieldguidespodcast.com/new-blog/2022/5/20/ep-56-lets-get-nuts
I don't think J. Nigra is indigenous to the Mediterranean.
As far as I know it mostly only grows in mid/eastern US, and Canada.
Would it have been a different walnut that Pliney saw?
Sorgoleone sounds like a mob boss
When Hank said PS2 I was hit with years of video game nostalgia, any body else feel the same?
Man, those are some smart plants. How did they know to do what they do?
Is There one that affects weeds?
wait... I'm now only realizing Hank is part of the SciShow... It's been a while since I watched this show but I watched his tiktoks.
He’s been part of SciShow for years and is one of the most common, if not the most common, hosts.
@@evilsharkey8954 Now I know!
The much loved mango trees also hamper growth and fruiting of other fruit trees, even flowers have a tough time.
Lettuce, bok choi, tomato etc aren't spared either
Maybe it's cuz of the mango's urushiol content? That's also the chemical that causes contact dermatitis from poison ivy and the rest of the Toxicodendron family (which literally means 'poison leaf').
@@timapple6586 It could well be! -the 'milk' that leaks from a freshly picked mango does irritate the skin. I'll read about it now that I know what to search for; thanks for that :)
and the fruits too. it fell and obliterated some of me houseplants. sometimes i wish it never fruits since i can get mangoes at grocery stores anyway
And today I learned that mangoes belong to the 'cashew family' ... wild😅
That first thistle is called 'Patterson's Curse' here because of the damage it does to crops--and stock won't eat it and shouldn't if they do.
Rhododendron also do this. Also we say jug-lone not ju-glone lols
Is it possible that the competition between the plant has forced some to evolve and thus is why we have different kinds of fruits and vegetables?
Let me guess; the discoverer wanted to name the Sorghum chemical for her favourit film director but was drunk while filling out the form, right?
You’ve got to take into consideration all the time effort and energy that goes into actually growing, harvesting, processing the heck out of the allelochemicals producing plants. It’s usually not all that worth it money wise. Often times, there’s a need for space to actually grow the thing that’s used as an herbicide that is as big as the field you wanna apply it on. I think we’re still a long way from seeing natural herbicides being used. And besides, it’s not cause it’s from plants that it’s not harmful, these are toxins, they’re designed to kill…
It's a starch eat starch world out there
Datura and tobacco and black walnut hull mixed with water a strained put it in a spray bottle and used as a herbicide and the datura with and tobacco in a spray bottle as a pesticide make sure to thoroughly clean anything you using this but typically it's sprayed on tomato leaves but I just spray it on weeds and not on the food
1. The black walnut will likely kill those tomato leaves. 2. Jimsonweed and tobacco are poisonous but they are also in the same family as tomatoes. You are likely to introduce Tobacco Mosaic Virus and other shared pathogens of the nightshade family by doing this. My pepino dulce plants got TMV from smokers (cigarette butts) in the apartment above mine back in college.
@@erikjohnson9223 I spray it lightly on the weeds poping up and obviously use plants that aren't sick that the tobacco company's can't do " if it's smokable and has nicotine they'll use it " and don't over use it like every other herbicide from the past 80 years that gave multiple people cancer but let's ignore 50 to even 100years "if you just wanna talk about jimsonweed then we can go back thousands" of use on crop plants in poverty ridden countries
We've used plenty of things 20 times more toxic than atropine and scopolamine in datura with our agriculture "jimsonweed is toxic" when in the right doses it's used as a medicine and sometimes an abused drug when used right just like the nicotine in tobacco can be used as a pesticide and herbicide if you have better ideas for natural agriculture control that you don't need a lab to make and spent 20 years abroad studying botany and helping small communities grow food that they couldn't before then go ahead and tell me your ideas that don't involve transporting lab chemicals to places across the great blue I'd r eally love to hear them just don't go around spouting crap you heard on a Google search or the same regurgitated crap you heard from some old lady in a country where your next meal isn't a worry
I'd hope people would do research and I wouldn't have to directly say we use a very diluted version of it on the plants and use a more stronger mixe on undesirable plants and use it very sparingly but I guess this is the internet where people think they know things because they found it on Google plus those diseases that effect the nightshade family are basically non existent in certain places
A true cereal killer. I've seen everything. I can die now LOL.
Love the title😅
Don Sorgoleone: I know it was you.
how did pliny the elder learn this thing about a north american tree? I know juglones are produced by a few different member of the walnut (juglans) genus, perhaps a different walnut?
Persian walnut.
There's Cereal killer, then there's me. >:]
Bring in Tasha the Amazon to do a future plant video please! Hank is still a fantastic presenter though. : )
No no no no please im begging you dont
He's amazing! But Tasha is also awesome! I have a soft spot for Kallie on PBS Eons - such a charm!
2:31 - You do realise the PS5 is out now and has been for a while?
Scrub oak does the same thing! Kills grass under it!
Cool.