Using Worm Castings Effectively in Clay Soil

Castings Alone Won’t Fix Heavy Clay

Worm castings are nutrient‑rich but particle‑size similar to clay, so they don’t improve drainage or tilth. For lasting soil structure:

• Add gritty sand (granite dust) or expanded shale (Soil Perfector, PermaTill) – 1 inch spread, tilled 8 inches deep.
• Mix in pine mini‑nuggets to create pore space.

Combine these mineral amendments with organic matter for a balanced, well‑draining garden soil.