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kolah
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Interesting point Bud! Humidity in my greenhouse is about 15-20%.
How about going the old school 70s method and make a humidity tray to set them on? Tray that won't leak water, deep enough to place about an inch of gravel and fill almost to the top with water. Temperatures aside, that RH alone is enough to drive evaporation. If you use dark rocks and/or dark/black plastic to line it that could further serve as a heat sink, too.
***Edit*** Oh yeah, you might want to follow the storm track on the one that just passed through our area. Gave us just over 1/2" of rain by my measure (a few buckets left in different areas outside).
I would use something white, not mirrors. Like the stuff we used to floor my flowering room... I can't remember what it's called but it's only about a quarter inch thick and was fairly inexpensive, washes clean fairly easily.anyone ever try using mirrors on the ground/floor to catch more sunlight to the lower part of plants? My plants are in a greenhouse in 5 gal buckets and I have thought about laying some mirrors around the bottom of the buckets.