You can set your potted orchid in a tray filled with water and gravel - the water will evaporate from the tray and increase the ambient humidity - or you can drape plastic sheeting around your orchid-growing area.
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the water will evaporate,List([72, 96))
a tray you the water You
filled can drape will evaporate can set
with water and gravel
plastic sheeting L:around your orchid-growing area
from the tray
your potted orchid L:in a tray