(You can't really tell how tall they are, but trust me!) I ripped out several ferns that were in the way of the blackberries, but left the ones in the back of them, since John likes them.
4 foot high cobra-like blackberry bushes, and giant ferns from the age of the dinosaurs. Not cool, yard!
Then, I endeavored to make a sort of trellis for the blackberries to climb, in the hopes that I would be able to actually access blackberries, instead of climbing into the bushes and ending up covered in scratches. Yesterday, I bought some giant tomato stakes, and some tough green wire.
I set the poles about 4 feet apart, then tied the wire to them. Then I realized that the blackberries were a bit too far away, so I tied a few to the wire with some velcro and fabric ties.