Answer: Probably the least toxic method of controlling crabgrass is to lightly cultivate the area about when the forsythia blooms, then apply several inches of organic mulch. The gentle scratching of the soil will disturb many of the crabgrass seeds just as they are germinating and kill them. The mulch will then exclude light from the remainder and prevent them from germinating. Alternatively, there are preemergent weed control products that will control crabgrass by preventing it from germinating (as well as other seeds) as long as the soil surface remains undisturbed. These products should be applied according to the label instructions.
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