Ask the Expert: what kind of weed is this? My dad has a garden that has been growing an invasive ground cover weed that has clover shaped leaves with tiny white "flowers". He has sprayed with all sorts of weed killers and nothing seems to work. It seems to stay only in the garden and has not crept onto the grass. It's very viney like.. grows like a carpet. Has been tilled repeatedly.. he left the garden area unplanted for a year to see if that would help get rid of it but it keeps coming back. They seem to grow from the root. When pulled from the garden they always seem wet even when there has been no moisture applied to the garden at all. He suspects that it started in a small area and was spread by use of the tiller. They grow very close to the ground only.. max of 2" inches tall. He has tried to pull them many times and when he does the base of the weed (green) will pull off from a white, slippery, more solid structure. I do not have a photo [...]