Coffee Grounds - Use them Twice Newsletter
Coffee Grounds - Use them Twice!
COFFEE - Slugs and snails hate caffeine, researchers have discovered. Robert Hollingsworth of the United States Department of Agriculture's Agricultural Research Service in Hilo, Hawaii, and his colleagues discovered this secret while testing caffeine sprays against the coqui frog, an introduced species that infests potted plants. They found that a 1 to 2 percent caffeine solution killed most of the slugs and snails in two days. Concentrations as low as 0.01 percent repelled the pests. A cup of instant coffee contains about 0.05 percent caffeine, and brewed coffee has more.
Coffee grounds can also be used to repel slugs and snails, but a caffeine solution is much more effective. Caffeine is more effective against slugs than metaldehyde products. The United States bans metaldehyde residues in food, but classifies caffeine as safe. It may even qualify as organic, adds Hollingsworth.
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