Organic Slug, Snail, and Centipede Control

Perimeter Barrier That Works

A proven method from San Juan Island (slug capital): line the garden perimeter with cedar sawdust, create a shallow depression, fill with rock salt, and cover with a 1×4 board "roof" attached to fence posts. Rain won't wash it away; slugs and snails won't cross.

Inside-the-Bed Cleanup

• Lay boards flat on soil overnight; slugs shelter underneath.
• In morning, scrape slugs off boards into soapy water.
• Repeat until population crashes.

Centipedes

Generally beneficial predators; minimal plant damage. No control needed unless numbers are extreme.

Why Other Methods Fail

Beer traps, diatomaceous earth, and copper tape work temporarily but don't stop reinvasion. The perimeter barrier + board trapping is the only 100% effective organic system reported.