Soft Rock Phosphate
Soil Supply Co.

Soft Rock Phosphate

Release Speed Slow
1
2
3
4
5
Size
$6.00
Description

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.

0 - 9 - 0

Phosphorus (9%), Calcium (19%)

Provides long-term slow release of phosphorus, plus slow-release calcium.

Mix 5–20 g per 5 L of soil when building your mix (optional). A slow-release phosphorus and calcium source — high-P amendments can suppress mycorrhizae, so use only where needed.

Soil people, same as you.

Soil Supply Co. started because we got sick of paying premiums for inputs that under-delivered. If we wouldn't put it in our own soil, it's not on the shelf.

Our story