Alert - vermiculite & perlite (unsuitable grades) | Miscellaneous | GEEKGARDENER

Hi .

Just posting this so others using these media, are alerted to the existence of undesirable grades of these materials

I've not yet used any of these materials but am planning to use perlite a soon as the nursery guy gets it

Quote : Vermiculite available

locally is for industrial use and often

contaminated by oil residue etc…

Perlite: Several reasons why we don't

like this material: the grade available

is industrial, being imported it is too

expensive; it can lead to fluoride toxicity

for sensitive plants and is one cause

of leaf chlorosis.

http://www.hoscoindia.com/article2.htm

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