In a few patches on the Bluff, we have uprooted and cleared the invasive Himalayan blackberry to make way for new plantings. But in most areas we rely on repeated clipping as the method of control, to allow native plants to thrive that would otherwise be smothered. Both methods are very labor-intensive. We don’t use herbicides.
At this time of year, many of the stronger blackberry canes will arc back down to the ground, where the growing tips thicken and begin to sprout new roots ready for the rains to return. Left undisturbed, over the fall and winter these tip-roots will quickly grow and embed themselves, to form distant new growing points in the spring. It’s a very efficient way to cover more ground.
There is never a bad time of year to attack the blackberries, but any clipping we can do in the late summer/fall has the added benefit of stopping this secondary growth phase while the new tip-roots are still easy to lift. Help us continue the fight. You might pick a patch of the Bluff that you love, focus your efforts there and see it transform over the seasons.
Rose City Bluff Restoration 
My Black-Capped Raspberries do the same in my yard, I’m working on expanding where they grow. Native, and a fruit, what could be better!
LikeLiked by 1 person