Coffee grounds can be an effective natural deterrent for slugs and snails due to several factors:
1. Caffeine Toxicity Coffee grounds contain caffeine, which is toxic to slugs and snails. When these pests ingest caffeine, it can lead to dehydration and death.
Studies have shown that even low concentrations of caffeine can significantly reduce slug and snail populations, making coffee grounds a safer alternative to chemical pesticides
2. Physical Barrier The texture of coffee grounds can also deter slugs and snails. The sharp edges can cause discomfort to these soft-bodied creatures, discouraging them from crossing over the grounds.
3. Acidity Sensitivity Slugs are sensitive to acidic environments, and coffee grounds are slightly acidic. This acidity can make areas treated with coffee less appealing to slugs, prompting them to avoid those areas altogether
Application Tips To use coffee grounds effectively, sprinkle them around the base of plants or create a barrier.
Alternatively, brewed coffee can be diluted and sprayed directly on the soil to deter these pests. However, it's essential to monitor the effects on beneficial insects and adjust usage accordingly to avoid harming the garden ecosystem