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Re: hosta-open DIGEST V1 #475

>maybe another boon, like buying pearlite at the masonery supply house
>(block insulation) 8 bucks a bag vice 14 at the nursery

There are different grades of perilite and some perilite has VERY high 
concentrations of fluorine that is toxic to plants.  The horticulture 
grade of perilite is suppose to have a very low level of fluorine that 
is not harmful to plants.  However, the building grade perilite MAY 
have very high fluorine concentrations and when you use it you may end 
up killing or severally damaging all your plants.  If you do use 
building grade perilite, TEST each bag by mixing a generous amount of 
it into your planting mix and growing some plants in it for awhile 
before using it wholesale in your planting mix.

Joe Halinar

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