Difference between blackberries Navaho Bigandearly and Summerlong

The online-shop for the original Lubera plants and thousands of more plants: www.lubera.co.uk
Lubera`s blackberries: www.lubera.co.uk/plants/soft-f...
Markus Kobelt, the founder and breeder of the Swiss fruit tree nursery Lubera, talks about how you can see the difference between the BigandEarly and the Summerlong.
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Do the Navajo blackberries send out runner roots that take over an area of garden if roots are not constantly cut/pruned out?

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The Navaho blackberries producing no runners.

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Which is more sweet? Original,big and early or summerlong

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Bigandearly have a short and early ripening time with big fruits. Summerlong ripes from August until begin of october and you can harvest medium to big berries.