Well I wanted to post an update for you folks who are wondering how my hedge rows were doing. Drew/Erin purchased their first blackberry plant and so I wanted to tell them yay and show them what they can expect next year.
First off, a warning of mixing fruit trees with nut trees. In my country wisdom book I read last year a chemical that is given off by nut tree roots system which spreads to the surrounding soil and doesn't allow fruit trees to produce buds/blossoms. I had said I would look that up, however time has limited me today to follow up on that research. However it is a survival defense for the tree so that it can allow its own seeds to fall and reproduce with any fruit tree taking up the space.
Second when pruning your brambles be sure to either trash the cuttings or burn them. If you don't your inviting all sorts of problems including fungi/rust issues.
Country Wisdom book has some very good instructions on how to raise berries. I credit them for me getting a nice harvest the first year and this years harvest is going to be wonderful. I do side dress my plants 3 times a year with 100% organic fertilizer and start to trim the main new stalks when they get 4-5 feet long. This alows for as many branches to grow for the next years harvest.