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VANSIL W10 Wollastonite, 50 pound bag

  • Model: VANSIL W10, 50#
  • Shipping Weight: 50lbs


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Vanderbilt Minerals VANSIL W10 Wollastonite

Natural Calcium Silicate Fertilizer, OMRI Organic Approved


Use as an alternative to limestone and to provide Plant Available Silicon and Calcium in your soilless potting mixes.

Wollastonite, a natural calcium silicate mineral, is unique among soil amendments as a source of silicon and carbon-neutral calcium. VANSIL wollastonite is sourced from a Vanderbilt Minerals deposit and processing facility in northern New York state. It is the only OMRI certified wollastonite mined and milled in the United States. It is not a slag by product.
VANSIL products are made by crushing, drying and milling the wollastonite ore. The same ore is used for all grades, which differ only in particle size distribution. VANSIL wollastonite is not contacted by flotation chemicals or chemical treatments of any kind. Because it is milled natural ore, elemental analysis can show natural minor variations. 

For best results, apply wollastonite according to soil test results and agronomic recommendations. Application rates will vary according to plant requirements and soil conditions. Consider soil/media pH as well as calcium and magnesium requirements in addition to silicon supplementation when using this product as part of a balanced fertility program

Horticultural Applications


Add 6 to 10 pounds of wollastonite per cubic yard of soilless mix (1/4 cup per gallon), or enough to adjust the pH of the media into the desired range.

Home Gardens:

Add 1 cup of wollastonite per metre of row at seeding. Use 2 tsp. to 1/3 cup of wollastonite per plant at transplanting. Topdress plants with 2 tsp. of wollastonite weekly or bi-weekly.

Market Gardens/Field Vegetables:

 Spring or fall application; incorporation is recommended. Apply at 1.5 to 4 mT/ac. Sandy soils, soils low in organic matter; cucurbits and brassicas will respond to higher rates.

Typical Chemical Analysis (calculated as oxides)

Calcium Oxide (CaO) 45% Calcium (Ca)   34%
Silicon Dioxide (SiO2)  50%

Total Silicon (Si) 24%

Soluble Silicon(AAPFCO 5 day method) 3.6%

Aluminum Oxide (Al2O3)   0.7% Magnesium Oxide (MgO)   1.5%
Iron Oxide (Fe2O3)   0.2% Sodium Oxide (Na2O)   <0.1%
Manganese Oxide (MnO)   <0.1% pH of a 10% slurry 10-11



This product was added to our catalog on Sunday 20 March, 2016.

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