Nontoxic Slug Control by Arzeena Hamir The best way to combat slugs is to understand their lifecycle. Know thy enemy! Slugs themselves contain a high percentage of water and will begin feeding as soon as soil temperatures rise above 40 F (5 C), emerging from the soil or from protected areas. Slugs prefer to forage at night or on dull days when temperatures drop and the garden is damp. Their gelatinous eggs, laid in clusters of 40-100, can be found in the soil, under rocks and even in outdoor pots. Learn to recognize them! http://www.gardenguides.com/articles/slugs.htm