Are you referring to the Himalayan blackberries as boysenberries? The ones that are non-native and invasive and grow literally everywhere? I find those quite delicious myself, they make the best jam. I've never had the patience or interest in gathering the small native blackberries, although I do have them. I leave those for the critters.
Himalayan blackberries (non-native, invasive, bushy)
Pacific blackberry (native, trailing)
