Alan Gould wrote in message ...
In article , Mike Lyle
writes
Gosh! All along I thought the small regrowths must be seedlings. Live
and learn: thanks to both.

Bramble seedlings could be grown by saving seed from blackberries, but
if propagation did happen to be desired, a better way would be to let
the tips of runners root into soil. They will do that anyway if you
leave them to their own devices.

No, we're trying to kill 'em, not grow 'em! (Interestingly, I've never
had a thornless volunteer seedling from a thornless parent.)

Mike.