Common dayflower Commelina communis
IDENTIFICATION — In late spring, common dayflower’s blue flowers open at the end of the stems. Each flower lasts one day, opening only in the morning or on cloudy days. This weed grows up to 2 ft. tall with weak, floppy stems, which root easily wherever the leaf nodes touch the soil.
FAVORITE CONDITIONS — This annual weed is found in part shade to full sun in the moist soil of cultivated gardens.
CONTROL — Dig out the roots or use a herbicide when you see the flowers begin to form in late spring.