Crushed oyster shell can look like a practical garden-bed barrier, but a rough surface is not the same as proven slug control. The short answer is that current evidence does not establish crushed oyster shell as a dependable way to stop slugs or snails. So, do oyster shells deter slugs? They may be marketed or…

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Online landscape design service from Shellscapes: sustainable outdoor plans, 15+ 3D renders, climate-ready planting, and the $1,350 Signature Package.

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