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Get rid of Slugs and Snails - Organic Method.
October 24, 2004

A 1 to 2 percent caffeine solution killed nearly all the slugs and snails within two days. Concentrations as low as 0.01 percent put the pests off their dinner. A cup of instant coffee contains about 0.05 percent caffeine, and brewed coffee has more.

Coffee grounds are already recommended as a home remedy for keeping slugs and snails at bay. Grounds repel slugs, but a caffeine solution is much more effective: Slugs turn back immediately after contacting the [caffeinated soil].

Caffeine is more effective against slugs than metaldehyde products.

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