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Yup, sorry, but it's worse than anything except Ivy , and that only by reason of its fruit and the fact it doesn't smell bad.
Grub out every sprout you see, as soon as you see it, and get all the root: it's much easier than doing it later. Keep it up, and eventually you'll run out of seed-load and root fragments. I have been told.
The last time mine were under control was right before I got pregnant the first time. My husband is a great believer in the great round toit, and the seedload/burls dated back to before anybody knew what horrors the "new, easy, fruitful family garden plant!" would hold. Right before I damaged my back badly enough to be flat for two weeks, I was on a pace to get them under control in... three months? Maybe?
You will all hate me...but years ago I planted (Yes PLANTED) some blackberry bushes...hoping for berries. I could not get them to grow. They were not healthy. I did have some raspberries....but mother killed them.
They don't do well in heat, or dry weather, or on soil that's got too high a pH: that's why they haven't eaten Eastern Washington.
There was an abandoned farm just east of the I-5 US2 junction in Everett where you could see the very top of an old hay barn sticking up in the middle of about 80 acres of Himalaya blackberries: it was pretty scary.