I have three blackberry bushes on the way, and I'm trying to prepare the area, but I'm not sure how the bushes grow. Will they be a bush? Or a vine? Because something I just read said you can train them up a trellis? I wanted them as big bushes, for the main wall of our chicken run, is that a mistake? Any tips would be great. I'm pretty new to major gardening, as this is our first house, but I want to get moving on beautifying this big dry yard.