Sarah Hinckley sarahh@suiattle.net
Wed, 21 Oct 2015 14:02:10 PDT
Please excuse a perhaps naive question (I'm new to this business), but 
I'd heard that here in the (mostly) damp Pacific Northwest, that perlite 
gets algae/green stuff on it.  Have those of you in the PNW had this 

Sarah in Seattle

On 10/21/2015 11:22 AM, Leo Martin wrote:
> Due to transportation costs, pumice tends to be mined closest to where
> it is sold. It is unavailable in many parts of the US without special
> ordering, and I doubt sedimentary Europe has many sources. Different
> colors and particle sizes have been available. The mine in Arizona
> closed, and I have heard the same about the one on the slopes of Mount
> Shasta in California.
> Succulent growers in places where pumice is unavailable use the horse
> stall material, but wash it well with water and a screen to remove the
> fines. I use my pumice fines in some of my clay-like mixes.
> A lot of people make sure their pumice and perlite is wet before
> working with it to try and avoid breathing the dust.
> I use large-particle perlite for my succulents when I cannot get
> large-particle pumice. I will cover the mixture with a thick layer of
> sand or desert clay soil to prevent pumice from surfacing. I don't
> have the problem of pots staying wet too long in my climate.
> Leo Martin
> Zone 9?
> Phoenix Arizona USA
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