In midsummer, when bindweed is at the height of its growth season but has not yet set seed, spot-treat isolated patches with glyphosate, taking care to avoid contact with desirable plants. If the weed is twined around desirable plants, detach it before treating. Repeated applications are usually needed to destroy the root system. Back to top Blackberry. Wild blackberry can be a vexing weed almost anywhere in the United States, but it's particularly troublesome in the Northeast, the Southeast, and many areas of the West.
Plants spread rapidly by underground runners and by seed.
To control, pull young plants in spring, before they develop a perennial root system. For chemical control, cut stems to the ground and apply glyphosate to the stubs as soon as possible after cutting. Spot-treat any new shoots with glyphosate as they appear. Or spray triclopyr or glyphosate on mature leaves, taking care to avoid contact with desirable plants. Back to top Common Mallow.