3. Crabgrass
It only takes a little bit of sunlight breaking through your grass to allow crabgrass to grow, and usually it appears when you’ve mowed the lawn too short. Dig out the crabgrass, roots and all, and then set your mower’s blade higher. Corn gluten will help prevent crabgrass, too. But, again, it has to be applied in early spring, before the crabgrass has taken root.
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