Answer: Maintaining a dense, healthy lawn through proper turf selection, establishment, and maintenance is the recommended non-chemical control for the crabgrasses. Avoid light, frequent irrigation, spring cultivation, short mowing, and summer fertilization. They can also be hand-pulled or mechanically removed.
Chemical Control - Apply preemergence herbicides before germination when soil temperatures stabilize at 50 - 55?F for several consecutive days; postemergence herbicides should be applied when plants are small.
Dandilions and other broadleaf weeds can be controlled with a chemical such as 2,4-D or by hand digging.
Feed your lawn 3 times a year, mow and water regularly and you should have a thick enough lawn to crowd out weeds.
Best wishes with your lawn!
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