Houseplants need high humidity, right? Wrong. Most common houseplants have proven to do quite well in very dry, indoor winter air even though these same plants are native to naturally humid environments. As long as you keep the roots well supplied with water, most indoor plants will do fine without added humidity. Daily misting to increase humidity is a waste of time. At best it raises humidity for 10 minutes out of a 24-hour day. If you want to increase humidity, buy a humidifier (your skin and furniture will also benefit) or set up humidity pebble trays under your plants.