Calcium Montmorillonite Clay

Calcium Montmorillonite Clay — a trace mineral colloidal silicate from The Soil Makers that nourishes living soil with nearly 50 mineral compounds.

• The minerals are colloidal, meaning they are in a form ready for immediate utilization by the soil and all the life that thrives there. This calcium-rich clay supports soil life, improves mineral balance, and is OMRI-listed for use in organic production, making it a trusted choice for organic soil, living soil systems, organic potting soil, and water-only soil blends.
• Immediate mineral access for roots and microbes thanks to colloidal minerals.
• Soil-building power supports structure, moisture retention, and nutrient availability in organic soils and living soil mixes.
• OMRI-listed for organic production, suitable for organic soil, living organic soil, and organic potting mixes.
• Easy to apply as a soil conditioner in spring or fall at 300 lbs per acre.
• Sizes and pricing: 10 lbs — $28 (free shipping); 50 lbs — $48 (plus shipping).
• From The Soil Makers, with decades of soil science behind every bag, this clay conditioner helps you build a resilient soil food web for thriving gardens and healthy harvests.