Jane McGary janemcgary@earthlink.net
Wed, 21 Oct 2015 16:59:34 PDT
Sarah asked

On 10/21/2015 2:02 PM, Sarah Hinckley wrote:
> 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 problem?

Here in the maritime Pacific Northwest, EVERYTHING gets green stuff on 
it. We just hope most of the green stuff has pretty flowers.

Almost every kind of grit I've used for topdressing in seed pots 
eventually acquires algae and moss, but pumice holds out for 2 or 3 
years against them. Perlite of course would not be used on the surface 
of a pot, but if you don't apply a topdressing it will "float" to the 
surface of a mix that has other lightweight components (such as peat and 

Jane McGary
Portland, Oregon, USA

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