Calcium Montmorillonite Clay

Calcium Montmorillonite Clay is a trace mineral colloidal silicate soil conditioner containing nearly 50 mineral compounds in a colloidal, immediately available form. This calcium-rich clay nourishes living soil, improves mineral balance, and is OMRI-listed for use in organic production.

At a glance

• Type: Trace mineral colloidal silicate clay conditioner
• Minerals: Nearly 50 mineral compounds in colloidal form
• Availability: Colloidal minerals ready for immediate use by soil and soil life
• Certification: OMRI-listed for organic production
• Application rate: 300 lbs per acre, spring or fall
• Sizes: 10 lbs and 50 lbs

Best for

• Organic soil and living soil systems
• Organic potting soil and water-only soil blends
• Improving soil structure and moisture retention
• Boosting nutrient availability in living soils

How to use

Apply as a soil conditioner in spring or fall at a rate of 300 lbs per acre. Incorporate into organic soils, living soil mixes, or potting blends to supply colloidal minerals and improve structure, moisture retention, and nutrient availability.

About The Soil Makers

The Soil Makers bring decades of soil science to every bag, helping growers build a resilient soil food web for thriving gardens and healthy harvests.