BL4 , It seems to me that you mentioned that you liked black raspberries ??
I had a couple canes growing right at the base of a couple of black walnut trees.. they started themselves, with the help of birds, I presume.. I also have a couple of bushes near the house. I am going to try to root some of the canes to help them spread. they don't spread through the roots like reds do. the cane has to touch the ground and take root..
just thought you might like to know this.
If I am successful, maybe I can dig some and bring them to the bash next spring..
don't hold your breath, but wish me luck.
.....jiminwisc......