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Trish from Melbourne, Florida writes,

Does SpeedZone Lawn Weed Killer Concentrate kill dollar weed on St Augustine?

I have used Bonus S by Scotts and it seems my lawn is worse now. At what temperature can I apply if it will help my lawn?


Speedzone Lawn and Weed Killer is not labeled for use on St Augustine and most likely would cause damage if used on St Augustine lawns. Speedzone Southern is labeled for Dollarweed and for use on St Augustine grass. According to the Speedzone Southern product label: The turf tolerance to this product may vary and temporary turf grass yellowing may occur on St Augustine. Do not apply Speedzone Southern to Floratam, Bitterblue or other improved species of St Augustine. Do not broadcast or spot spray St Augustine during the fall to winter transition or if temperatures are expected to fall below 40F within 10 days of the application.

Please take a few moments to read through the product label completely for full instructions and other precautions.

Answer last updated on: 12/12/2011

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