Roots Organics Phos Rock, 55 lb

Natural Phosphate Rock for Flowering & Fruiting, 55lb

Flowering and fruiting stages both lean heavily on phosphorus and calcium availability, and phosphate rock is one of the more direct natural sources of both. Roots Organics Phos Rock takes that raw mineral and processes it into a form growers can actually work with, sifting it down so it mixes cleanly into soil or a growing medium instead of clumping the way unprocessed rock phosphate often does.

This 55lb size is sourced and harvested with bat-friendly methods, giving commercial and large-scale growers a bulk supply of phosphorus and calcium to encourage vigorous flowering and fruiting.

Key Features & Benefits

• Derived from phosphate rock — an excellent natural source of both phosphorus and calcium
• Carefully processed & sifted — makes the mineral easy to work into soil or growing media
• Flowering & fruiting support — phosphorus and calcium availability encourages vigorous development at these stages
• Bat-friendly sourcing — harvested using methods chosen to protect bat colonies

Who Should Use Roots Organics Phos Rock

Growers who want a natural phosphate rock source of phosphorus and calcium, in bulk, to support flowering and fruiting are the fit for this 55lb size.

About Roots Organics

Phos Rock is the base mineral input behind several other Roots Organics products, including the more concentrated Super Phos Rock, part of the natural amendment catalog Aurora Innovations has built from Eugene, Oregon since 2000.

Frequently Asked Questions

What is Phos Rock derived from?

It's derived from phosphate rock, a naturally occurring mineral recognized as a source of both phosphorus and calcium. Roots Organics processes and sifts the raw rock to make it practical to apply.

What nutrients does it provide?

Phosphorus and calcium are the two nutrients Phos Rock is valued for. Both play a direct role in supporting flowering and fruiting development.

How is it harvested?

It's sourced and harvested using bat-friendly methods, chosen to maintain quality while protecting the bat colonies associated with the source caves. Roots Organics applies that same sourcing standard across its other cave- and guano-derived amendments.

How is it different from Super Phos Rock?

Phos Rock is the standard-strength mineral source, while Super Phos Rock is a more concentrated version carrying a defined NPK of 0-12-0 with 24% available calcium. Growers who want a milder, general-purpose phosphorus and calcium source use Phos Rock; those who want a stronger, more targeted flower hardener use Super Phos Rock.