Down to Earth Rock Phosphate 0-3-0 | 5lb - OMRI Listed - (Case of 6)

OMRI Listed Soft Rock Phosphate Providing Long-Lasting Phosphate and Calcium (5lb)

Down to Earth Rock Phosphate 0-3-0 is an OMRI Listed soft rock phosphate, also known as colloidal phosphate — a natural, untreated source of long-lasting phosphate and soil-building calcium. Phosphate remains available across a wide soil pH range. For availability, soft rock phosphate should be mixed into soil or compost prior to planting.

The 5lb size (Case of 6) is convenient for home gardeners and small-scale growers who incorporate rock phosphate into garden beds, raised beds, or potting media before planting to build long-term phosphorus reserves in the soil.

Key Features & Benefits

• OMRI Listed — Approved for certified organic production.
• Natural, Untreated Source — A natural soft rock phosphate — also called colloidal phosphate — that is untreated and unprocessed.
• Long-Lasting Phosphate — Provides a slow-release phosphorus source that remains available in the soil over time.
• Soil-Building Calcium — Supplies calcium alongside phosphate, contributing to soil structure and plant nutrition.
• Wide pH Availability — Phosphate from soft rock phosphate remains available across a wide range of soil pH levels.

Who Should Use Down to Earth Rock Phosphate 0-3-0

Rock Phosphate 0-3-0 suits organic growers, market gardeners, and home gardeners who want a long-lasting natural phosphorus source for soil building. It is particularly valuable for those who amend soil before planting to build phosphorus reserves for the season and those who prefer a slow-release, untreated phosphorus source over more soluble phosphate amendments.

Soft Rock Phosphate and Soil Phosphorus

Soft rock phosphate (also called colloidal phosphate) is a naturally occurring mineral source of phosphorus and calcium. Unlike highly processed or acidulated phosphate fertilizers, soft rock phosphate is used in its natural form and releases phosphorus gradually as it weathers in soil. It is valued in organic production for its long-lasting availability across a wide soil pH range. Mixing it into soil or compost before planting allows time for microbial activity to begin releasing phosphorus in plant-available forms.

Frequently Asked Questions

What is soft rock phosphate?

Soft rock phosphate — also known as colloidal phosphate — is a naturally occurring mineral source of phosphorus and calcium. It is used in its natural, untreated form and provides a slow-release phosphorus source that remains available across a wide range of soil pH levels.

Is Down to Earth Rock Phosphate 0-3-0 OMRI Listed?

Yes. It is OMRI Listed and appropriate for certified organic production.

How should Rock Phosphate 0-3-0 be applied?

For best availability, soft rock phosphate should be mixed into soil or compost prior to planting. This gives it time to begin releasing phosphorus in plant-available forms through soil microbial activity and weathering processes.

Will Rock Phosphate 0-3-0 work in all soil types?

Phosphate from soft rock phosphate remains available across a wide soil pH range. However, incorporation into soil or compost before planting is recommended to allow time for the phosphorus to become available to plants.

Does Rock Phosphate 0-3-0 supply any nutrients other than phosphorus?

Yes. In addition to phosphorus, soft rock phosphate supplies calcium — an essential secondary macronutrient for cell wall formation and root development. The calcium content contributes to soil building alongside the phosphate.