Oooo! We recently had our blackberry season here too! There is a HUGE patch just down the road from us, free for anyone to come pick, and we MISSED OUT! We were just so darn busy we never did end up picking any, although the neighbors ended up with LOTS. I was glad to get grapes at least. Next year I fully intend on making some jam with blackberries too. I dont know how much natural pectin is in blackberries though, I wonder if I would need to buy some for those, haha!