Asiatic Dayflower Commelina communis

This imported plant (from Asia, as its common name shows) is a pest to gardeners, and a rabid invader of other plants' space. Its lovely blue flowers make it tolerable in small doses, but it is rare to get dayflowers in small doses. As its genus, communis, suggests, it froms huge spindly "communities," which choke other plants, and return in full force year after year.