Misting houseplants from time to time may help keep leaves free of dust, which will allow plants better access to the light they need for photosynthesis. However, regular misting is not considered good practice because it increases the likelihood a plant will develop a fungal or bacterial leaf spot disease, according to the University of Minnesota Extension. Frequent misting also does little to increase relative humidity for a plant because the water evaporates rather quickly, only raising the humidity for a brief period.
Shower or Sink
Set the plant in the shower or kitchen sink. Use a detachable shower head or kitchen sprayer attachment to spray the plant foliage gently with tepid water. Start on one side of the plant and work your way around. Try to avoid spraying any flowers the plant may have. Allow excess water to drain out the bottom of the pot and to drip off the leaves before returning the plant to its saucer.
Take larger plants outdoors and spray them with a fine sprayer head attached to a garden hose. Make sure the water coming from a hose is not too hot or too cold, which could shock or injure the plant. Spray an even, gentle mist on all of the plant leaves. Allow the plant to dry off out of direct sun before returning it to its indoor location.
Allow tap water to sit for a day or two to give gases time to evaporate. Or, use distilled water in the sprayer, which is what the University of North Dakota Extension recommends. Pour the room-temperature water into a spray bottle with a fine mist setting. Mist each leaf, but try to avoid spraying any flowers on the plant. Allow excess water to drip off and drain out of the pot before putting the plant back.