Free
shipping

Wollastonite (Calcium Silicate)

$ 20⁰⁰

Taxes and shipping calculated at checkout.

Reusing your soil? Get a soil test with analysis and add only the amendments your soil is actually missing. Learn about soil test analysis or take our quick quiz.

Calcium and silicon in one

A natural calcium silicate mineral that supplies available calcium and silicon, helps plants resist powdery mildew and neutralizes soil acidity.

Key things we want you to know

Swap for: agricultural limestone, as a pH corrector.
Made by: crushing, drying and milling wollastonite ore.

Application & Mixing

Application rates vary according to soil conditions and plant requirements. Apply Wollastonite according to your soil test results, taking into consideration the soil pH, the calcium and magnesium requirements, and silicon supplementation.

Sizes, Shipping & Bulk

Free shipping in the continental USA only. Does not include Alaska, American Samoa, Micronesia, Guam, Hawaii, Marshall Islands, Northern Mariana Islands, Palau, Puerto Rico, US Virgin Islands, Armed Forces Americas, Armed Forces Europe or Armed Forces Pacific.

Lab Reports & Resources

Wollastonite Heavy Metals Test (PDF, opens in new tab)

Reviews (6)

Shipment arrived quickly, and the product has a beautiful consistency. Just applied today, so we’ll see how it goes. Very hopeful!

Excellent, tested amendments

I trust KiS with my garden thanks to their dedication to testing and transparency.

this stuff is excellent both for calcium and added silica

this stuff is excellent both for calcium and added silica.

Quality!!!

Quality!!!

Great

This is working well mixed into my soil. Very pure. I haven't had any calcium issues, so I'm assuming it's doing a great job. I need to have a soil test done to confirm that it has helped maintain a steady ph. Will order this again when needed. Definitely keeping this in the toolbox for calcium amendments.