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John from Tampa writes

What is the safe application temperature using Hi-Yield Atrazine Weed Killer for st Augustine?

I notice that you are not supposed to use on St Augustine when temps are above 85 deg. I also noticed that you recommended a July application to someone in central Florida. I find this confusing. How long after application must the temp stay below 85 after application to not damage st Augustine grass?

Answer:

Hi-Yield Atrazine Weed Killer can be applied early in the morning before temperatures reach 90 degrees if it's expected to get this hot on the day of application.  You just do not want to apply during the time of high temperature because your desirable turfgrass is under more stress in high heat.

Answer last updated on: 10/09/2017

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Hi-Yield Atrazine Weed Killer

Hi-Yield Atrazine Weed Killer

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