Purslane, sometimes called wild portulaca or pusley, is particularly troublesome in vegetable and flower gardens. This summer annual thrives in hot, dry weather and is seldom found in the spring when gardeners are controlling other weeds. Its wedge-shape eaves are 1/2 to 11/2 inches long and rubbery. Small yellow flowers open only in full sunlight from midsummer to frost. The seeds may remain viable in the soil for many years and will sprout in warm weather when brought to the surface during plowing or cultivating. The thick, reddish brown stems grow vigorously, forming a thick mat and rooting wherever they touch the soil. The stems and leaves store water that enables purslane to survive drought periods and to grow in cracks in sidewalks and driveways. Plants pulled and allowed to lie on the soil will reroot. Plants are killed by the first fall frost.
Spray the lawn when the weed is actively growing.