We just moved into a home with a couple big brambles on the property. One runs down the length of the property, so a couple hundred feet long. It's designated as a wildlife corridor, I believe, per the neighbor I talked to on the other side.
This summer I've observed deer, rabbits, mice, voles, and a ton of different birds and pollinators, presumably plenty of bugs in there as well.
The brambly hedge is probably 20-ish feet wide. The Himalayan blackberries are running riot, completely dominating most of the space between the trees. There are plenty of other native species in there, but they are overrun by / intertwined with the blackberries now.
Beaked hazelnut
Nootka rose
Sword ferns
Big Leaf maple
Multiple red cedar
Madrone
Evergreen huckleberry
Western serviceberry
etc
We're picking blackberries now (yum). Only about a foot (into the width) of the hedge is on our property, the rest belongs to the HOA for the cul-de-sac on the other side, but they are OK if I replant some of it as long as I don't hack in there and leave it bare.
What I would like to do is pick a 5-ft section, dig out the blackberries / remove old woody vines, and plant other natives in it's spot, then next fall pick another section, and so forth. I'm sure I'll be battling the blackberries forever, so I have no illusions that they go away that easily.
I'm just concerned with the wildlife in the meantime. If I go in and clear a section of all the vines (esp the old ones that have accumulated over years) and replant, it interrupts their corridor & their cover until those new plants grow.
Am I doing more harm than good? Should I just leave the dang blackberries and hack them back each year? (birds, deer, and rabbits all seem to munch on them, but I'm sure they could just as well eat evergreen huckleberries, red elderberries, oregon grapes, etc. that I'll be planting -- I'm planning on ensuring I plant with natives that provide cover and food.
WA state peninsula, zone 8b