More purpuratas

[Roberta]

Ben -
How do you deal with the low water pressure issue with the Hozon? (I think that 60 pounds per square inch is the bare minimum that it requires) And the 50-foot limit?

My water pressure isn't going to get any higher. And my yard is skinny but long (an "L" that goes the full length of the house and around a corner, half the width).

[Ben_in_North_FLA]

I have used up to 150 ft of hose with no problem, I either use my thumb to gently spread the water flow or use a full flow diffuser. such as on this link

Dramm Full Volume Water Breaker Noz.zle

If you want a serious fertigation product and have a few hundred $ to spare a dosmatic injector would be ideal and then water pressure is not a problem. When I had 2 shadehouses with overhead misting I piped a dosmatic in and it was awesome. Lasted about ten years. then I didn't want replace as I was getting out of orchid world and the hozon syphon sufficed

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[Roberta]

Remember, I'm just a hobbyist not a commercial grower. My greenhouse is insignificantly small, I grow mostly outside (selecting orchids that tolerate the conditions that I can give them as a backyard grower) Are conditions ideal for all of my orchids? No. But they seem to be "acceptable" - I get good growth, and lots of flowers, at all times of the year. A pretty eclectic assortment, including some weird and interesting stuff. What else could I want?

[Ben_in_North_FLA]

from a quick browse through your pics I would say you're doing AWESOME, I have seen many commercial growers who could not possibly be that successful growing blooming all the types you have shown.
so, for a small greenhouse the hozon syphon is a very acceptable fertigation device. You may have some plants that are heavy feeders and some that are not, be mindful of that.

[Roberta]

The really heavy feeders, like Catasetinae in rapid growth period, and Cymbidiums, get a top dressing of time-release fertilizer to supplement whatever they get from my infrequent fertilizing. I don't grow a lot of Vandas (stick mostly to the relatively few cool-growing species... no room in the GH for big things) but they get whatever they get, and bloom anyway. (Things like V. tricolor, V. roeblingiana, V, coerulea, and even Ren. imschootinana)