Quote:
Originally Posted by Swimmingorchids
I got the idea from watching a commercial greenhouse in holland. They had acres of orchids in plant tables and were watered via sprinklers from above which as we know is a big no no to avoid crown rot. In greenhouses with ventialtion I suppose they can get away with it.
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Before I retired, I drove 50 miles one-way to work, so left at 6 a.m. to avoid most of the traffic, making it necessary to water the greenhouse about 5 a.m. That got tiring pretty quickly - especially leaving for work in wet clothes - so I set up an overhead deluge system with remotely-controlled solenoid valves.
One click of a button while drinking a cup of coffee and "the rains came" for 30 minutes before automatically shutting off.
I had pretty good air flow, so watering that early in the day gave the plants plenty of time to dry, keeping crown rot to a minimum. Over the course of several years, I adjusted the potting or mounting details so that every plant in there could be watered at the same time without issues. Semi-hydroponics helped that a lot for many of them, as you simply cannot overwater those.
A funny story about getting soaked while watering: I had a doctor's appointment, but had to water before going. When I weighed-in, he said "You seem to have gained a little weight since last time." I told him I had just watered the greenhouse and was soaked. He paused, then said "Hmm. I've never had a man tell me he was retaining water before...".