Natural Slug & Snail Control: Firefly Larvae, Copper & Predators

Slugs and snails (gastropods) lay hundreds of eggs that can wait years to hatch. Chemical baits kill predators too. Instead: copper barriers (reacts with slime), diatomaceous earth (reapply after rain), or iron phosphate pellets (Sluggo). Geese, garter snakes, lizards, frogs, birds, and predatory nematodes eat slugs naturally.

Firefly larvae (Photinus, Photuris, Pyractomena) are voracious slug/snail predators. They can be purchased or encouraged—Terry Lynch (byteland.org) consults on firefly breeding. Native species only; importing risks ecological disruption. Fireflies glow because they're toxic to predators—a built-in defense.

Decollate snails eat other gastropods but may turn to plants. Coffee grounds repel slugs but can flavor tomatoes. Best long-term strategy: build habitat for diverse predators, avoid chemicals, and use targeted barriers for vulnerable beds.