Answer: If the grass is crabgrass, which germinates right about when the forsythia blooms, you can control it by lightly hoeing or raking to disturb the seedlings and then applying several inches of mulch over top of the soil. The mulch will exclude light and prevent additional seeds from germinating, it will also smother any little seedlings the hoeing may have missed. Once you plant the annuals, the mulch will continue to help suppress weeds and will eventually help feed the soil as it breaks down over time. As a bonus, it also helps keep the soil cooler and moister.
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