St. Augustine grass - Knowledgebase Question

Clermont, Fl
Question by mkmalys
November 23, 2009
We spread Scotts Winterizer on our lawn today before realizing that it had no weed control in it. I can't believe Home depot does not have the one with weed control available. This is Florida. What's my next step? Aren't winter weeds coming? We have some in back. Thank you.

Answer from NGA
November 23, 2009


Winterizer fertilizers rarely contain weed killers because weeds respond best to herbicides when they are actively growing. Cool season weeds such as henbit, chickweed and clover are a serious problem in dormant St. Augustine grass. These weeds can be controlled by hormone-type herbicides in early spring.

Postemergence weed control should be used in early spring. General home lawn broadleaf weed control can often be accomplished using selective postemergence formulations which contain two or more herbicides. Formulations are available for most southern grasses. Examples are Green Light Wipe-out, Spectrum 33 Plus, Trimec, Ferti-lome Weed Out and Ortho Weed-B-Gon II for Southern Grasses.

Most labels will stress use on younger weeds growing in the cooler mid-spring to early summer period. A temporary discoloration of the lawn usually occurs. Repeat application in 2-3 weeks.

A healthy St. Augustine grass lawn will effectively crowd out most weeds. But St. Augustine grass that is not properly maintained or is weakened by insects or disease can be invaded by grassy and broadleaved weeds. So your best defense is to feed, water and mow your St. Augustine on a regular basis to help it grow thick enough to crowd out weeds.

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