This year's "jam session" yielded about 3 gallons of blackberry and raspberry jam. We picked a little more than 20 lbs of fruit and used this foolproof recipe
This is a native trailing blackberry. Usually you find it down along the creeks. I transplanted a few along my lower fence line 20 years ago and the blackberries have never looked back. Tis year the ground squirrels and I are in a battle to see who will get to eat more of them. So far the squirrels are winning.
Blackberries are ripe and ready for pies, jams and other good stuff. Now it's just a race between me, the squirrels and the birds to see who gets more.