Well-drained growing media (was Oh No! A Boophonedisaster!)

Eugene Zielinski eez55@earthlink.net
Tue, 06 Oct 2009 17:48:45 PDT
Another option is to check around for "sponge rock".  This is large sized
perlite that some orchid growers use in their growing media.

Eugene Zielinski
Augusta, GA

> [Original Message]
> To: Pacific Bulb Society <pbs@lists.ibiblio.org>
> Date: 10/6/2009 8:26:18 PM
> Subject: Re: [pbs] Well-drained growing media (was Oh No! A
> On 5 Oct 2009, at 18:02, Leo A. Martin wrote:
> > I have wanted to try some of the larger-particle perlite, often used for
> > insulation, but I have been warned much of this is very high in
> > and toxic to plants.
> Change that "is" to "may be". If you feel you must use insulation grade
> in spite of these warnings, you can mitigate the risk by adding lime to
the mix 
> as calcium fluoride and magnesium fluoride are very insoluble and thus
> presence of Ca++ and Mg++ ions in the soil will tend to soak up any F-
> by the perlite.
> -- 
> Rodger Whitlock
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