Roots Organics Super Phos Rock, 55 lbs

Concentrated Phosphorus & Calcium Flower Hardener, 55lb

Some flowering programs call for more concentrated phosphorus and calcium than a standard rock phosphate amendment supplies, without wanting to switch to a fully synthetic mineral salt. Roots Organics Super Phos Rock is that more concentrated option, extracted from select caves using bat-friendly methods and carrying an NPK of 0-12-0 with 24% available calcium.

This 55lb size is fast-acting and meant to be used carefully and sparingly, as a targeted flower hardener rather than a routine, broad-based amendment.

Key Features & Benefits

• NPK 0-12-0 formula — a concentrated natural phosphorus source, considerably stronger than standard phosphate rock
• 24% available calcium — supplements the phosphorus supply with a substantial calcium contribution
• Bat-friendly cave extraction — sourced from select caves using methods chosen to protect bat colonies
• Fast-acting, sparing use — recommended for careful, targeted application rather than routine feeding

Who Should Use Roots Organics Super Phos Rock

Growers who want a concentrated natural phosphorus and calcium source for targeted flower-hardening applications, rather than general-purpose feeding, are the fit for Super Phos Rock.

About Roots Organics

Super Phos Rock is the concentrated counterpart to Roots Organics' standard Phos Rock, both extracted under Aurora Innovations' bat-friendly sourcing standards from the company's Eugene, Oregon base.

Frequently Asked Questions

What is the NPK of Super Phos Rock?

It carries an NPK of 0-12-0, considerably more concentrated than standard rock phosphate. That concentration is why it's recommended for careful, sparing use rather than routine feeding.

How much available calcium does it contain?

Super Phos Rock supplies 24% available calcium alongside its phosphorus content. That calcium level supports the flower-hardening role the product is marketed around.

How is it harvested?

It's extracted from select caves using bat-friendly methods, the same sourcing standard Roots Organics applies to its other guano- and cave-derived amendments. That standard is unchanged from the sourcing used for the line's standard-strength Phos Rock.

How should it be applied?

Apply it carefully and sparingly, since it's both fast-acting and highly concentrated compared to standard phosphate rock. It's intended as a targeted flower hardener rather than a base fertility input.