Joseph Kraatz plantnut@cox.net
Tue, 02 Jul 2013 21:24:51 PDT
Dry Stall is supposed to be large.  Little smaller than a pea.   It is made for horse stalls.  It would not be useful if it created dust when the horses walked on it.   Joe

On Jul 2, 2013, at 4:46 PM, Rodger Whitlock <totototo@telus.net> wrote:

> On 2 Jul 2013, at 15:33, Ina Crossley wrote:
>> I am using pumice in my mixes, but only recently.  I bought the 7mm one 
>> which seems to have a lot of dust and small stuff in it.  Does it still 
>> do it's job of drainage with all the small stuff filling any gaps.
> If you intend to pot up a plant in nothing but pumice, be sure to wash it. I 
> have found that otherwise, the fines are washed down to the drainhole, pile up 
> against the piece of fly screening I customarily put over the hole, and block 
> drainage.
> Pumice by itself is a very good potting medium for certain plants. I use it for 
> Weldenia candida (which happens to grow natively near the tops of Central 
> American volcanoes, according to the literature), and a few honest-to-God high 
> alpines.
> Pumice is actually quite nutritious in a limited sense, containing a lot of 
> potassium.
> You are justified in your unhappiness with this supposedly-washed pumice you've 
> been sold. Even when it's going into a potting mix, I wash it first over a It's 
> shocking how much fine material comes out.
> -- 
> Rodger Whitlock
> Victoria, British Columbia, Canada
> Z. 7-8, cool Mediterranean climate
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