st.augustine - Knowledgebase Question

san diego, Ca
Question by meloneyblue
March 27, 2010
what kills weedscrabgrass in st. augustine?


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Answer from NGA
March 27, 2010

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Crabgrass starts germinating when soil temperatures are 50 to 55 degrees F for ten or more days and germination can take place over a 6 week period. Pre-emergence herbicides provide excellent weed control for crabgrass but they last only about 30 days. The compound prevents the weed seed from germinating, but it will not kill the newly sprouted seedlings. Late February to early March is an ideal time to apply pre-emergence control. A second application might keep your lawn a little more crabgrass free. Since it's almost April and you've missed the timing as far as pre-emergents go, you might want to try raking it out or hand pulling. Next spring use the pre-emergent, reapplying in 30 days. That should keep the crabgrass under control. As for the other weeds, you can use Ortho? Weed-B-Gon Weed Killer for St. Augustine Lawns, or Scotts? Bonus S Weed and Feed for Southern Lawns.

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