Ground ivy is also is called gill-over-the-ground and creeping charlie. This perennial member of the mint family is a weed problem in turf and ornamentals. It has a blue flower. One of the better identification features is the scalloped edge of the round leaves. Acting as a vine it moves out from underneath trees and shrubs and creeps across the grass area rooting from the nodes as it travels. Herbicides control it in the lawn but it soon reinfests from the tree and shrub areas.