If you have those big ant hills skim off the first inch of so. Then take the dirt that is below that. Use it to bed and cover your trap. Put a FINE skim of natural dirt if you think it is necessary.
The ants sort of wax the chewed up vegitation making it impervious to water. I have had 2 inches of rain fall without getting the anthill dirt even damp. Dry dirt can't freeze
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