Hi Sjean,In an open air environment it may not even make a 2% difference in RH. If the tray is covered witha clear plastic dome, the RH can be controlled very nicely, up to a very high value, by opening or closingthe air vents in the top. If there are no vents, cut some in the dome and use strips of tape to open and close them.peterSjean who said:>......trays of water with pebbles to keep the pots out of the water, yet I seem to recall reading >somewhere that this doesn't help raise the humidity at all.
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