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Frustrated from Southernbellesville writes

Why do the instructions on Hi-Yield Atrazine Weed Killer state to only use this twice a year?

My once-beautiful yard has been taken over by florida betany. It's the plague! Atrazine is the best herbicide I've found to kill it, but I've had to use it more often than twice a year, more like four times, twice in the Fall and twice early Spring.

Answer:

The EPA gets to decide how often a chemical can be applied. They usually make this decision based on how long the product lasts in the environment, what kind of damage can be caused by over application and many other technical factors.

Answer last updated on: 02/20/2013

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