How to kill oxalic, black medic weeds? - Knowledgebase Question

Houston, Te
Question by stephenshin
April 28, 2009
I tried

Answer from NGA
April 28, 2009


This is the best time to get rid of the weed as the black seed clusters are just now maturing. It is fairly easy to pull which is the best method of control, since it is an annual, and reproduces only by seed. Once the plant and seeds are removed then next years crop will be greatly diminished. Any chemical weed killer will be of little benefit as these are currently fully grown adult plants. The time to apply a chemical is when the weed is very small and before it has reached reproductive stages. There is a product that targets chickweed, clover and black medic (Ortho) but be sure to read the label to make sure it is safe for St. Augustine lawns. This weed grows in the same type of environment as clover and they are often seen together. One other important fact, black medic can be an indication the lawn has too little nitrogen so be sure to put your turf on a regular feeding, watering and mowing schedule to help it grow thick enough to crowd out future weeds.

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