How to get rid of crabgrass killer? - Knowledgebase Question

Katy, Te
Question by lipikapatel
April 18, 2010
Hi We live in Houston. During the month of Feb we had applied weed and feed to our lawn. However during this time our lawn front and back are full of crabgrass. We also bought Scotts 5,000 Sq. Ft. Halts

Answer from NGA
April 18, 2010


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. Watch the weather - late February to early March is an ideal time to apply pre-emergence control. A second application might have to be made to 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 again, reapplying in 30 days. That should keep the crabgrass under control. Agralawn Crabgrass Killer is the only product I know of that is safe to use on your St. Augustine turf. It contains baking soda which, for some reason, attacks crabgrass but not St. Augustine. You can try using regular baking soda on a test area of your lawn. It should kill the crabgrass. If so, you can use it over the entire lawn without harm if you cannot find Agralawn Crabgrass Killer. 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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