Lawn pennywort is a perennial with bright-green, 1/2-inch, rounded leaves with wavy edges. Small white flowers bloom from July to August. The creeping stems root wherever their nodes touch the soil. If not controlled, pennywort can form dense mats that crowd out desirable plants. Pennywort grows in moist, shady lawns, gardens, and unplanted areas. It is frequently mistaken for ground ivy. Some gardeners prefer to allow pennywort to grow as a shade-tolerant groundcover rather than try to eliminate it.
In vegetable gardens, remove the weeds by hand-digging. Be careful to remove all the stem pieces so they do not resprout into new plants. Where possible, dry out the soil and cultivate to control pennywort.