On Jan 28, 5:46 pm, Scott Simpson wrote:
I cut them to the ground, put RoundUp on them, and they still grow back! How
do I kill these darn things? Thank you.

Round up should work. Try letting the plant grow a bit and wait for
leaves to appear then shoot it again. Round up works best on the green
parts of plants, so the more green you can cover the better. It may
take several attempts, just spray whenever you see leaves appear.
Plants won't survive without leaves.