How does Blackberry breeding work? Is it like apples and potatoes where you
have no idea what the seeds will produce without actually planting some and
waiting for a crop or is it more definite than that? In other words can your
Zone 3 be crossed with other varieties to get the best of both without the
outcome being a total guess? I think there is a market for a zone 3
blackberry, but probably an even bigger market for a zone 3 BB crossed with
something like a boysenberry, or better yet a boysenberry created with your
zone 3 BB as a parent. Here is a Wikipedia entry that says boysenberry is a
cross of BB, Raspberry and Logan berry.
http://en.wikipedia.org/wiki/Boysenberry If you can get a zone 4a
boysenberry lots of people will be eternally grateful.