10 Tips for Getting Rid of Crabgrass for Good

Timing is everything with crabgrass control. Pre-emergent herbicides prevent seeds from germinating, so apply one in early spring, just as soil temperatures reach about 55°F (often when forsythias or dogwoods begin to bloom), and water it in well to activate it before crabgrass ever has a chance to sprout.

A thick, healthy lawn naturally crowds out weeds like crabgrass. Regular fertilization, proper mowing, and overseeding thin areas help create dense turf that leaves little room for crabgrass to take hold.

Crabgrass loves sunlight, so mowing higher (around 3 to 4 inches depending on grass type) shades the soil and prevents crabgrass seeds from getting the light they need to germinate. Never cut more than one-third of the grass blade at a time.

A deep soak about once or twice a week encourages grass roots to grow deep into the soil, making them more resilient and better able to outcompete crabgrass, which prefers weaker, shallow-rooted turf.

If you notice young crabgrass plants before they've set seed, pull them by hand — it's easier when the soil is moist. Try to get the whole root system to prevent regrowth and stop the spread before next year's seed bank grows.

If crabgrass has already sprouted, spot-treat it with a post-emergent herbicide designed specifically for crabgrass, applying it while weeds are young (less than 3 inches tall) and following label directions to avoid harming your desirable grasses.

Feed your lawn in early fall and late spring to strengthen it against crabgrass invasion, and avoid heavy fertilization in summer, which can sometimes favor weed growth over grass.

Crabgrass is opportunistic and will quickly move into bare or thin areas, so reseed these patches immediately and cover them with straw or mulch to protect the seed and help it establish first.

Compacted soil makes it difficult for healthy grass roots to grow but gives crabgrass an easy spot to thrive. Core aeration once a year, preferably in fall, loosens the soil and gives grass a better environment to flourish.

Crabgrass control isn't a one-time effort — it often takes a full year or two of consistent management to significantly reduce or eliminate it. Apply pre-emergents, mow properly, and maintain a thick lawn each season, and over time you'll dramatically reduce crabgrass and enjoy a healthier, greener yard.