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Calphos Soft Rock Phosphate - Regular Powder (50 lb) - F2101

Planting and Growing Asparagus

Planting and Growing Asparagus

$18.99
  • Cannot be combined with other items in a package, due either to its size or manufacturer packaging.
  • Does not qualify for flat rate shipping.
  • In stock. Ships from our warehouse in Northern California.
Buy big, save big with quantity discounts
  • Buy 10 for $17.09 each and save 11%
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For Phosphorus Also called colloidal phosphate.

The best natural source of phosphorus and calcium. It is comprised of the bony structures of prehistoric marine creatures mined in Florida from the best deposit in the country.

An immediately available and a long-term source of phosphorus. Not the same as the hard rock phosphate, sold by most nurseries and farm suppliers, which is not nutritionally as readily available.



Available only in 50 lb bags (FOB Grass Valley). Averages 20% P2O5 (3% immediately available), 20% Ca.



Soft Rock phosphate should be applied and worked in prior to planting. Use at 5 lb/100 sq.ft. or 1 ton/acre on phosphate deficient soils, less on fertile soils. Supplies P and Ca for up to 5 years after application, depending on the crop. Trees and perennials, use 1-10 lb per planting hole, depending on plant size.

Important Information for Certified Organic Growers

We do our best to update our product's organic status, however the status of any product can change at anytime without notice from the manufacturer. Please confirm that the product is allowed by your certifying agency and that it's still OMRI Listed® at www.omri.org

Customer Reviews

Great for my soil type

This has been my staple when planting directly in my otherwise unamended soil! My plants love it!

Review by (on )
Foothill Staple

This is a really cost effective, natural phosphorus supplement. Living in the foothills with phosphorus deficient soil this is a must have.

Review by (on )

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