Yes, but did they use a Kona blend?

USDA Agricultural Research Service scientists, reporting in the journal Nature, have found that caffeine can kill or repel snails. The study took place in Hawaii, and examined caffeine's effects on the orchid snail, a costly pest of Hawaii's orchid industry. In preliminary experiments, a 2 percent solution of caffeine in water applied as a spray to the coconut husk-chips material in which orchids are grown killed up to 95 percent of the snails. In another experiment, the researchers showed that growth medium treated with the 2 percent caffeine solution had only 5 snails when checked 30 days after the spray was applied, in contrast to the 35 snails that they found in growth medium that had been treated with a standard dose of metaldehyde, a common molluscicide. Future investigations will provide further details about the ability of caffeine sprays to protect plants. Source: Marcia Wood, USDA-ARS

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