Top Pick
Top Pick
Grow Organic
Grow Organic Calphos Rock Phosphate
4.7
$9.99
In stock
at
SeedTime (retailer)
Who it's for
- Sustained Nutrient Delivery
- Certified Organic Soil Amendment
- Dual Mineral Boost
Who should skip it
- Delayed Availability
- Fine Powder Consistency
- pH Sensitivity
Key Specs
Nutrient Content
Averages 20% P2O5 (3% immediately available)
Secondary Nutrient Content
18% calcium
Release Duration
Provides nutrients for up to 5 years
Package Size
5 lb
Application Rate
5 lbs per 100 square feet for general use
Form
Finely ground powder
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