Al,

I used it for a while to try to slow down the green slime that grows on top
of the moss. No slime, no fungus gnats. Although I saw no ill effects on
the orchids, I did not think it slowed down the slime enough to justify the
cost. I do know an orchid growers who use it exactly as you describe and
swears by it. He heats with natural gas and has been pushing down
greenhouse temps for the last couple of years. I think his Phal houses are
now in the mid 50's with other greenhouses even lower. I have never used
it for this because I am pretty happy with my copper ion injector, but I
guess it will be put to a test this winter.

Pat

"Al" wrote in message
...
A former employer at a wholesale nursery plant production facility runs it
through his drip/irrigation lines. He alternates it with fertilizer.
These lines feed directly into pots of soil containing the likes of
poinsettia cuttings or pansy plugs, etc depending on the season... It was
the darkest, dampest, coldest greenhouse I have ever been in but nothing
ever rotted and everything always seemed to be ready on schedule; full
trays of blooming pansies six or eight weeks after plugging.

I wonder if this approach would work works with pots of damp sphagnum in
the winter when oil is too expensive to use to heat higher than 55
degrees.


"Pat Brennan" wrote in message
...
Zerotol is a broad-spectrum algaecide/fungicide that is labeled for plant
use (as compared to being labeled for use on hard surfaces). It has a
zero hour REI and requires no respirator. It is available from most of
the grower supply companies.