Answer: Ortho's Chickweed and Clover Control will take care of clover if applied now, in the spring. You can also try this approach to changing the environment to favor your grass over the clover: Give your lawn a good feeding in fall with a fertilizer that is relatively high in nitrogen and low in phosphorus to discourage clover growth and increase the turf's ability to compete. In the summer, try to shade out the clover by mowing your grass to 3", and make sure the blades are sharp. Stressing the lawn by mowing it low or ripping it with dull mower blades only makes it less competitive with clover, which thrives on low-mowing and low-nitrogen conditions.
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