My friend has a box of this whitish powder which claims it's powdered volcanic rock.  It's supposed to be used to fix nutrients near the plants, when you add fertiliser on top of it.

I've never heard of this.  Does anyone know what it is, what it does and how it works?

(apologies if this turns up twice - it seemed to be in the talkback section, which it isn't image)


  • Whitish powder ?  Did it come with a rolled up Fiver to snort it thru image

    Seriously, I've never heard of it so be interested to see what others comment.

  • Steve 309Steve 309 Posts: 2,754

    Hmmm... no  - if it had we'd be off to Costa Rica or somewhere coz it's a 2kg box!

  • Ah well.......just a thoughtimage

    If it is volcanic rock, I'd always been under the impression that it is an inert material.

    I imagine Edd or Mike Allen would be the best people to answer this query.  Sorry Steve..........just seemed too good to pass upimage

  • CeresCeres Posts: 1,492
    Try Wikipedia. It has a short entry on this stuff and it doesn't mention gardening though Thai farming pops up.
  • Mark 499Mark 499 Posts: 379

    I have seen powdered volcanic rock for sale, supposed to add minerals to the soil, B&Q sell it under the Verve brand, some people swear by it.

  • Steve 309Steve 309 Posts: 2,754

    Just found this

    It's a type of clay, apparently, derived from volcanich ash.  Loads of it quarried in USA - so it clearly has an environmental impact.

    It seems that you mix it into the top foot of your sandy soil - looks like about a handful per square foot - to increase its water- and nutrient-holding capacity.

    They seem keen on it in Oz - Perth has sandy soil like I do.

    Anyone used it?

  • You can use it as a pond liner.

  • fidgetbonesfidgetbones Posts: 11,092

    It's also used for clearing wine.

    Steve, I have Sandy soil in part of the garden. Perth is a whole new game. They don't call the western Australians sandgropers for no reason. The only grass that will grow is called buffalo grass. I broke a spade trying to dig it up at my friends new house.

    It's not a mess, it's a nature reserve.
  • Steve 309Steve 309 Posts: 2,754

    The link above is to a TV clip from Perth.

    Tried it in my friend's garden (in northern Belgium) yesterday and it seemed to do the trick.  Time will tell if it holds the nutrients & water in, as claimed.  She has very sandy soil, as do I in Liverpool.

  • Steve 309Steve 309 Posts: 2,754

    Yes.  I suspect any finely divided clay would behave in the same way. 

    Whence stems the controversy?  The quarries needed for extraction?

  • Steve 309Steve 309 Posts: 2,754 they're selling off the clay that's been used to absorb (actually, probably aDsorb) toxic heavy metals for us to put on our gardens?  Where we grow food?  image

    Shurley shome mishtake?  Either that or something needs to be done about it!  Do the Environment Agency know?  Trading Standards?  And if the FSA know about it, why is it still available?! image

  • Steve 309Steve 309 Posts: 2,754

    ...and to EAT?

  • DovefromaboveDovefromabove Central Norfolk UKPosts: 42,781

    Think I'll stick to FYM - at least I know where that's been image

    Gardening is cheaper than therapy, and you get tomatoes. 
  • Steve 309Steve 309 Posts: 2,754

    LOL Dove image


    But you have a point!

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