In a grow room, you can raise your favorite plants all year long or temporarily keep tender outdoor plants from dying during the winter. You can also grow herbs and vegetables all year in a grow room. Atriums and small rooms with artificial light are popular grow rooms. Most plants need humidity in order to thrive; but indoors, humidity is often low, especially when the heat or air conditioner is on. Therefore, incorporate one or more methods to help increase the humidity in your grow room.
Set your plants together in a grow room. Plants let off moisture, which increases the humidity nearby.
Fill shallow containers with rocks and water. Then set the plants on top of the rocks. Do not set the plants in the water. Replace the water as needed when it evaporates.
Place a humidifier in the room. Humidifiers must be cleaned according to manufacturer directions, usually on a weekly basis. If not, bacteria will form and create a toxic environment for plants as well as for people and animals.
Mist plants several times a day to help increase humidity. Do not mist plants that have hairs on their leaves. Misting is not the most effective way to increase humidity in a grow room; but when combined with other methods, it may help.