 Vining weeds. The Carolina snail seed, probably the worst. Poison ivy, poison oak. You'd have to put smilex in that group. Although smilex you can get rid of. You can dig down where the smilex, the green briar is coming up. Dig down, pull the big tuber out of the ground. Chop it up and throw it in the compost pile and you're done with that weed.