SMokinJoe's method essentially turned a humidity tray into a humidifier. Nice use. However, in and of itself a humidity tray isn't going to do a thing. The surface area versus evaporation rate is far, far too low a ratio to produce notable humidity. I have them under my plants because they are a convenient way to catch the runoff from sprayings.
I am utterly unrepentant of my use of humidifiers. In my light room, which is also the warmest room in the house when the furnace runs, I use a cool-mist ultrasonic. It brought the level in the room from about 30% to over 65%. My kitchen grow-window is a cooler area (still Phal-habitable, though) and so I use a warm-air humidifier.
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