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math teacher · February 2, 2013, 03:54 PM

This question comes up a lot. I am still using powders I bought in the 60s. Powder can deteriorate over time. It depends a lot on how it has been stored. If it smells acrid or looks rusty, sprinkle it on your lawn.

February 2, 2013, 03:54 PM	#2
math teacher Senior Member Join Date: February 5, 2012 Location: Southwest WA Coast Posts: 559	This question comes up a lot. I am still using powders I bought in the 60s. Powder can deteriorate over time. It depends a lot on how it has been stored. If it smells acrid or looks rusty, sprinkle it on your lawn.