every spring when the grass is come in but its not to hot, i put on long pants, long sleeve shirt, gloves and a hat and go around ripping that stuff up
it still comes back, over time I've learned to aim the weed eater away from when I hit it, then when I finish i come inside and scrub my face and neck.
hate that stuff
Get a 2 gallon spray bottle and some glyphosate concentrate. It kills it at the roots. It'll kill everything else it touches, however. So you need to concentrate on only putting it where you want it to go.
