Decomposed Granite in Clay Soil: Excellent Mineral Amendment

Decomposed granite (DG) = rock powder. In clay, it's a superb amendment — not a gimmick.

Why It Works

• Mineral source: Granite = potassium, trace elements.
• Microbes/earthworms digest insoluble particles → release soluble micronutrients over time.
• Improves soil structure (grit opens clay).
• Synergizes with organic compost and compost tea.

Rock Powder Context

• Limestone = calcium.
• Basalt = broad spectrum.
• Seaweed = king (70+ traces) — but DG is great where seaweed unavailable.

Application

• Incorporate at 10–20% by volume when amending beds.
• Or topdress and till in.
• Combine with organic matter for microbial activation.

DG is not a quick fix — it's a long-term mineral bank. In central TX clay, it's a smart addition.