What is Rock Dust?

Rock Dust is still a relatively new gardening application. We have all heard about compost, manure, mulch, and even worm poo. But rock dust is something that has only come across my awareness in the past six months.

What is it?

As the name suggests, it’s ground up rocks (usually basalt or granite). It’s a natural mineral fertiliser which adds minerals back into the soil.

Why use it?

For a number of reasons. For the purely pragmatic, it will help retain up to 30% of water in your garden beds. For those of you, like me, who suffer from sandy soil, it’s a godsend. For those of you who are growing fruits and veggies: over time roots leach most of the minerals out of the soil. As a result a lot of our food (especially commercially grown food) is devoid of essential minerals that our food would ideally have. Rockdust helps to restore that balance and can provide up to 100 minerals and trace elements back to your plants. Plus, it makes your fruits, veggies and flowers grow better and prettier.

How do I use it?

  • You can sprinkle it over your garden beds, leave for 24 hours and then water in;
  • You can add it to compost and then dig it through the garden like normal;
  • You can mix it into a seaweed liquid fertiliser and then water into your garden like you would the liquid fertiliser normally;

There are other applications but these are the three that I’ve tried.

How often do I use it?

For the modest, time-poor or lazy gardener (see me, two years ago!), you can choose to use apply it at the start of spring. It’ll give your spring garden plenty of pep.

For those who spend a lot of time in their garden, apply it seasonally. Especially if you’re growing fruit and veggies. You’ll be glad you did.

Where do I get it?

Rockdust is becoming increasingly popular, so I’m sure if you ask at your local nursery that they will be able to help you out.

I buy my Rockdust (and most things for my garden) from the Diggers Club. If you’re a keen gardener and in Australia and not a member: you’re mad! They’re my go-to for everything gardening. I’m a little besotted with them.


One last thing I’ll say about Rockdust it is a great addition to potted plants too. Potted plants don’t benefit from having worms moving through them or a big garden bed to share the burden of providing nutrients. If you want beautiful potted plants, then treating them with a little bit of love here and there will make the world of difference!


Tiny Change for the Day: Add some rockdust to your garden beds next time you compost.

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