Bleach in the greenhouse?

Exchange your experience growing phalaenopsis in a greenhouse here. Also share your experience on what works for you with others.
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edge
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Location: La Conner, WA

Bleach in the greenhouse?

Post by edge » Mon Mar 30, 2015 10:04 pm

What is a reasonable concentration of bleach I can use in my greenhouse that will kill algae but not hurt my Phals?

David

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raybark
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Re: Bleach in the greenhouse?

Post by raybark » Tue Mar 31, 2015 5:01 am

I used one ounce per gallon (1:128) of ordinary household chlorine bleach (5.25% sodium hypochlorite) for years, then switched to Physan at 1 teaspoon/gallon (1:768). I later found that Biosafe Disease Control (formerly labeled as Zero-Tol) is far superior to either of them, as it has demonstrated absolutely no phytotoxicity whatsoever.

However, I have since observed that algae growth has been greatly reduced (dare I say "almost eliminated"?) since I cut back on my fertilizer concentration and started using a low-phosphorus formula (K-Lite).
Ray Barkalow, Orchid Iconoclast
Using science & logic to improve orchid growing

edge
Customer
Posts: 345
Joined: Wed Jul 19, 2006 10:59 pm
Location: La Conner, WA

Re: Bleach in the greenhouse?

Post by edge » Tue Apr 07, 2015 3:51 pm

Thanks Ray. I have some of the first generation Zero-Tol and haven't found it particularly effective. I'll try some old-fashioned bleach and 1 ounce per gallon.

David

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