Rockdust 400ML Front
Rockdust 400ML Back
Rockdust product
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This is a unique mix of Azomite® and micronised volcanic rock dust: it massively boosts the mineral content of your substrate and is ideal for adding to an initial substrate mix or as a remineralising agent for your living soil bed or used soil or coco if growing in pots.

Both Azomite® and volcanic rock dust are incredibly rich in mineral content and, when combined, they offer all trace elements your substrate requires, including:

  • Calcium,
  • Magnesium,
  • Iron,
  • Manganese,
  • Silicon,
  • Cobalt,
  • Zinc,
  • Boron, and
  • Aluminium.

Azomite® and volcanic rock dust products are both certified organic and many studies have been undertaken on them: these have found that when added to a fertilisation programme they improve root systems, yields, and overall plant vigour in a variety of field crops and garden vegetables.


Top dress 1ml per litre of substrate (0.5 tbsp/ gallon) monthly at any stage of plant growth. It is particularly beneficial to add into your initial mix with Grow or Grow AUTO (or early on in the vegetative stage) to give maximum time for microbes to break down the minerals.

For an indicative feeding chart showing how to use this product using a 20L pot, see our feeding page.

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