Weed control for winter - Knowledgebase Question

Woodbridge, Vi
Avatar for gshep7
Question by gshep7
June 10, 2010
My understand is that timing of pre-emergent herbicide is everything. For zone 7, can you recommend products and best date to apply a pre-emergent for winter annual broadleaf weeds, such as chickweed? Is there a way to use soil temperature as a guide? Finally, is there a pre-emergent that when applied in the fall, would still allow you to overseed at a later date that season?

Answer from NGA
June 10, 2010
Once you've applied a pre emergent, you should not overseed for about 12 weeks. The pre emergent is time released and will keep your lawn weed free for about 3 months by keeping the seeds from sprouting. Grass seeds will also be affected. So if you want to overseed your lawn in the fall, you'll have to hold off on the pre emergent until the new grass is established (usually after 2-3 mowings). If preventing weeds is your main goal you can apply a pre emergent in September or October (Scotts? Turf Builder? With PLUS 2? Weed Control) and then overseed in the spring. It is possible to overseed in the summer months as long as you keep the lawn well watered. If you want to overseed and apply a pre emergent all in the same growing season, overseed between now and August and apply pre emergent in October.

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