Humidity around plants can be increased by setting pots in water-tight metal or plastic trays filled with wet pebbles or sand.
(Humidity around plants; can be increased; by setting pots in water-tight metal or plastic trays) (water-tight metal or plastic trays; filled; with wet pebbles or sand)
Humidity around plants water-tight metal or plastic trays
can be increased filled
by setting pots in water-tight metal or plastic trays
with wet pebbles or sand