Any systemic weed killer should do the trick. Systemic means that it will permeate the whole plant. You can ask at any hardware store and they will have one. You want to let it work it's magic on the plant and get to every part of it so don't pull the plant out, just let the poison get to the roots.
I asked that on yahoo answers. Here is the answer I was given. Buy some cheep powdered laundry detergent.
The kind that has lye in it, and poor it on the area. Thy lye is suppose to kill the roots.When summer comes I guess that answer will be put to the test. Windgate
I know what you mean, Angie - those whitish tubers with the spiny vines that grow up into everything and almost heart-shaped leaves! I asked a local arborist what could be done, and he said "Move!". Good luck! Nance from Statesboro
I know how I got rid of mine wasn't exact the best thing to do for the environment, but....I mixed about a 1/2 bottle of Roundup with the same amound of Diesel and sprayed along my fence line after I cleared back the briar along the line. With the mixture in a sprayer you can control where you spray and it killed it all back and I'm not seeing any regrowth at all.
If they are growing back then you are not getting all the root. the root system of briars grows outward and can trail in different directions, take a hoe and dig in the direction the root is growing"this could be several feet" until you can no longer pull any more root. this may take a few diggings to find them all.i had the same problem, even now I can find one sneaking up and I have to attack quickly(ha ha), stay with it and you will be victorious!
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