Turf and Landscape - More on Ground Ivy Control

Now is a good time for herbicide treatments to control ground ivy in turf and landscapes. The following is additional information to add to the recent post.

Ground ivy (also known as creeping Charlie) is a perennial weed in the mint family that is a particular problem in shaded lawn areas and moist landscape beds. It can also grow quite well in full sun. Ground ivy is difficult to control because it spreads by seed, rhizomes, and stems that creep and root at nodes. Ground ivy survives mowing well due to the low, creeping growth habit and low mowing will favor its growth. It has been known to take over large areas of turf if not controlled.

In turf, control measures for ground ivy include mowing grass at 3" or higher, using cultural methods to thicken grass stands including fall fertilization and regular overseeding, and multiple applications of broadleaf herbicides containing triclopyr or fluroxypyr. 2,4-D and dicamba are active on some populations but control can be variable. Annual nitrogen rates above 2 lbs N/1000 sq ft decreases ground ivy by favoring the grass. In turf, broadleaf herbicides should be applied in the fall (Sep 15-Oct 15) and again in 3-4 weeks. Spring treatments have been successful in controlling ground ivy if broadleaf herbicides are applied after flowering and then again 3-4 weeks later. For severe infestations do both fall and spring applications. Treatment may be needed for many years to successfully control ground ivy in turf. In landscape beds, spot applications of glyphosate can be used for control. Isoxaben has some activity as a preemergence material.

Gordon Johnson, Extension Horticulture Agent, UD, Kent County