How can I get rid of wild blackberry bushes permanently?

• Cut everything down to about 12inches (300mm) above ground level.
• Let the area regrow for 3 to 4 weeks.
• Repeat the above couple of steps as many times as you can, three times being the absolute minimum.
• Immediately after you've cut down for the last time, dig the bushes out, doing your very best to dig out as much of the root system as you can.
• Then mechanically till the area. Remove any roots you see.
• After that, go out once a week with a "sharp" hoe and remove any vegetation that has popped its head above the surface.
• 4 weeks after tilling, mechanically till the area again. Remove any roots you see.
• Again, go out once a week with a "sharp" hoe and remove any vegetation that has popped its head above the surface.
• 4 weeks after the previous tilling, mechanically till the area one final time. Remove any roots you see.
• Finally, go out once a week for the next 2 to 3 weeks with a "sharp" hoe and remove any vegetation that has popped its head above the surface.

The area should now be ready for wildflower seeds..

Borrow a couple of sheep, put a temporary fence around the area (they do not try to get out so a couple of rows of white electric tape will do -hardest part is pushing those fiberglass rods into the ground. They will take care of all the blackberry bushes you have, never to return,make sure to provide water, that is all they will need. They love blackberry bushes

why would you want to ? they're delish!

Over fertilize to kill, a wise man once told me.

Please read this before you get a black berry bush, as there is a variety that is a delight and much more delicious, as well as native to the northwest known as Rubus ursinus. The himalayan berry is just a night mare in every way.

Roundup, MUCH easier than the first suggestion.