Growing conditions
totototo@telus.net (Wed, 26 Jul 2006 14:14:52 PDT)
On 25 Jul 06, at 12:27, Adam Fikso wrote:
...Has anyone checked the degree of coarseness of Perlite used
in building construction for insulation or manufacture of ceiling
insulating tiles? I can imagine that it might be much cheaper even
though it might not be packaged in less than cubic yard or carload
lots.
A reminder that such perlite *may* contain fluorides, which can
damage your plants.
Perlite sold as "horticultural" is selected to be free of fluorides.
There's no certainty where other kinds are concerned.
N.B. "may" "can" "no certainty"
--
Rodger Whitlock
Victoria, British Columbia, Canada
Maritime Zone 8, a cool Mediterranean climate
on beautiful Vancouver Island