Carpetweed
Carpetweed is a summer annual with a short tapwroot. Seeds lie dormant over the winter and sprouts slowly in the spring. Once it sprouts it grows rapidly in the summer heat.
Prefers fertile, dry, sandy or gravelly soil in lawns and landscapes along walkways. It is commonly found in shaded areas in the lawn and may be a problem in spring seedings of new lawns.
Control
Can be hand pulled or use a broadleaf herbicide in early to midsummer.
Prevention
Preemergenct herbicides applied in midspring will prevent carpetweed from developing. Keep the lawn vigorous through a regular fertilization program and good mowing practices.