White clover Trifolium repens
IDENTIFICATION — This low, 4- to 12-in.-tall spreading weed has white flowers and roots wherever stem nodes touch the soil, but it also spreads by seed. Some folks plant white clover because it adds nitrogen to the soil, which keeps the grass green during heat and drought.
FAVORITE CONDITIONS — White clover thrives in full sun in areas that are rarely tilled, such as lawns and perennial borders.
CONTROL — Broadleaf herbicides, especially those containing 2,4-D, are the most effective means of control for white clover. If you have white clover growing in your lawn, a fall application of nitrogen feeds the grass while it controls this weed.