Soft Rock Phosphate

Soil Supply Co. Verified independent store

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Soft Rock Phosphate is one of the best ways to build lasting phosphorus reserves in your soil. Unlike conventional fast-release phosphorus fertilisers, soft rock phosphate delivers its payload in slow-release, microbe-friendly forms that feed the soil over an extended period. Providing approximately 9% phosphorus and 19% calcium, this mineral supports strong root growth, solid plant establishment, and heavy flower production — two crucial elements that underpin a well-functioning garden from the ground up. Because it acts as a long-term resource, a less-is-more approach to dosing pays off — it's far easier to add less up front and top-dress or increase on the next run than to overload early. Show more