A wide expanse of weed-free green grass is the ideal of a perfect lawn mandated by most yard-of-the-month clubs. But when your neighbors have dandelions or crab grass, it can be hard to keep your lawn unblemished, especially when any stray wind can blow their seeds, like parachuting invaders, right into your lawn. At the first sign of weeds, your gut reaction may be to reach for a weed killer such as glysophate. But the best way to get rid of weeds in your lawn is to crowd them out with thick, lush grass.
Apply granulated weed-and-feed to your lawn with a broadcast spreader when the first forsythia and azaleas start to blossom. This is the time when crabgrass and other weeds begin to sprout. Weed and feed contains a pre-emergent herbicide that prevents weed seeds from germinating as well as a fertilizer to boost the growth of already established turf.
Reapply weed and feed within 30 days, as the pre-emergent herbicide wears off.
Set your lawn mower so that your grass remains 2 ½ to 3 inches tall. This will shade the roots of the grass and keep weed seeds from receiving the sunlight that they need to grow.
Water your grass deeply once a week. To do this, turn on your sprinkler and allow water to saturate the ground until there is an inch of standing water in the grass. The water will soak in for a deep saturation.
Pull up any clumps of crabgrass or weeds that emerge before they can produce seeds. Weeds in a well-watered lawn will pull up easily with a garden hoe.
Overseed your lawn with grass seed in the fall by cutting shallow furrows into your lawn with a rake. Then pour grass seed into the holding chamber of your broadcast spreader. Walk over your lawn in sections, as if you were mowing. The spreader will distribute seeds over your lawn. Water your lawn to germinate the seeds. The grass roots will develop throughout the winter, and a thicker lawn will be established by next spring.