Crusher dust = cracker dust = bluestone tailings etc. It's a cheaper and coarser basaltic crushed stone compared to bagged rockdust products. I got some into the soil in winter. Now I've got summer crops already started but wanted to add some more crusher dust. Can I use it successfully as a mulch, an inch or two, before digging it in after summer veggies finish? If it works as a mulch as well then I'd rather avoid the cost and inconvenience of straw etc mulches for the vegies. The main thing I'm looking for in a mulch is moisture retention and wettability, which is something organic mulches aren't that great for in my climate (Melbourne Australia). Anyone used crusher dust as mulch?


I guess it depends what you're growing - crusher dust is highly alkaline, with a ph reading of around 9, so crops like onions will be fine - blueberries won't. So if what you're growing likes alkaline conditions, seems it's a good idea.

  • Last time I got crusher dust it was ph 7.0. I think I'll just get it and be done with.
    – Chris
    Nov 28 '12 at 21:13

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