A natural mineral that strengthens grass at the cell wall.
Wollastonite is a natural calcium silicate rock dust, sourced in Ontario, and the silica is what sets it apart: stronger cell walls, tougher grass, better resistance to pests and disease — resilience built into the plant.
Local rock, measurable chemistry.
Sourced from Seeleys Bay, Ontario, wollastonite is a high-grade calcium silicate mineral ground into a beneficial rock dust — approximately 27% silicon, 16.5% calcium and 4% magnesium. Calcium benefits most Ottawa soils, but it's the silica content that makes wollastonite different from every other amendment in the toolkit.
Silica significantly strengthens plant cell walls — and the research indicates that translates into improved resistance to pests and fungal pathogens, upright plant structure, and better tolerance of environmental stress, with boosts to photosynthesis, chlorophyll production and nutrient movement through the plant. As agronomist Graeme Sait puts it: "The stronger the cell wall, the more stress-resistant the plant, whether that stress is from pathogens or non-living factors."
Worth reading: Canadian Wollastonite's grub-damage research · CBC: crushed wollastonite helps crops and captures carbon
Common questions.
What exactly is wollastonite?
A natural calcium silicate mineral, ground into a fine rock dust — roughly 27% silicon, 16.5% calcium and 4% magnesium. Ours is sourced from Seeleys Bay, Ontario, about an hour from Ottawa.
Why does the silica matter?
Silica strengthens plant cell walls. Stronger cell walls help grass stand upright, resist fungal pathogens and environmental stress, and trigger natural defence mechanisms — resilience built into the plant itself rather than sprayed onto it.
Is it connected to grub resistance?
The mineral's producer, Canadian Wollastonite, publishes research on wollastonite as a natural approach to controlling grub damage — their work, linked below, is worth reading if you're dealing with grubs. Our approach pairs amendments like this with the fundamentals: dense, deep-rooted turf on healthy soil tolerates pests far better than stressed turf ever can.
How would it get onto my lawn?
As part of a soil program — it's one of the amendments we select from when a soil test and what we find on site say your lawn would benefit. It's applied like any mineral amendment, and it works alongside compost, pH correction and the rest of the toolkit.