Answer: Pre emergent crabgrass control should be applied now, before the crabgrass seeds sprout. If your lawn is not greening up yet, it may still be a little cold in your yard. Regular feeding last year should have given the roots enough energy to produce new blades. Wait another 3-4 weeks before fertilizing. I think your lawn will green up when the soil warms a bit more. Best wishes with your lawn!
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