crab grass - Knowledgebase Question

clermont, Fl
Question by ricky_rbrsn
December 10, 2009
i put baking soda on the crab grass in my st.augustine grass and it looks like more damage is being done to the st.augustine, what can i do to make sure my grass do not die

Answer from NGA
December 10, 2009


Baking soda generally does not control crabgrass so I'm not sure why you applied it to your lawn, but I'd suggest flooding the lawn to leach it out of the soil. 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 April to early May is an ideal time to apply pre-emergence control. A second application might have keep your lawn a little more crabgrass free. At this point, 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. Proper lawn maintenance practices can limit crabgrass invasions. A dense stand of turfgrass prevents the weed from germinating and establishing. Fertilize at the end of May and remember that fall fertilizing, overseeding, aeration and thatch control can also limit spring problems. Best wishes with your lawn.

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