Creeping veronica, also called speedwell, prefers acid soil in moist, shady areas but is also found in sunny areas where the soil stays moist. It has oval, bright green leaves on low-growing stems. Tiny white flowers with blue or lavender edges bloom from May to July. The creeping stems root easily wherever the stem joints touch the soil. Pieces of stem cut and distributed by lawnmowers also root to start new plants. If uncontrolled, veronica can cover an entire lawn or flowerbed within a few years. It does not completely crowd out other plants, however.
Creeping veronica does not invade areas that are well fertilized, are well drained, and get lots of sunlight. It is difficult to control but can be hand-pulled; remove all parts of the plant so new plants do not emerge.