Wollastonite

(48% CaO and 52% SiO2). Cal Carb Equivalent 76.0%. Soluble-grade and at least 95% pure (may contain trace amounts of iron, manganese and magnesium). Silicon is not traditionally considered a limiting cofactor for plant growth, but researchers are finding that despite ample amounts of silicon in most soils, plants supplemented with silicon often yield better (even in prime growing conditions). Silicon strengthens cell walls, which reduces lodging and improves resistance to insects and disease; stimulates immune response pathways (possibly increasing production of resins and terpenes); and reduces transpiration (improving drought resistance).
Especially beneficial in sandy or muck soils, which are both naturally lower in silicon than clays and loams. May be applied as a foliar spray to build resistance to powdery mildew; for yield benefits, incorporate into the soil.
Particularly recommended for cannabis, orchard crops, cucurbits, sweet corn, grains and forage crops. Customer Norman B. of West Baldwin, ME, credits wollastonite for his exceptional potato crop in 2019: ”I bought a 50 lb bag of wollastonite and sprinkled it into the rows as I went along and the Green Mountains, which have a reputation for low yield, did commendably. Out of that small bag of seed, I filled a five-gallon pail, over 35 lbs, and that was after discarding some that I had damaged during hilling. My uncle stated that he had never seen so many large Green Mountains as well. I used a lot of composted horse manure, but I do every year. The only thing different was the wollastonite.”
Most soil tests do not offer recommended application rates for silicon; one approach is to use wollastonite to correct your soil pH. For this purpose, wollastonite has a liming equivalent of 86% (relative to Calcitic Lime). Dusty! Wear a mask when handling