How to Increase the Humidity in a Grow Room


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.

Step 1

Set your plants together in a grow room. Plants let off moisture, which increases the humidity nearby.

Step 2

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.

Step 3

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.

Step 4

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.

Things You'll Need

  • Shallow containers
  • Gravel or pebbles
  • Water
  • Spray bottle
  • Humidifier


  • University of Georgia Cooperative Extension: Growing Indoor Plants with Success
Keywords: humidity grow room, increase humidity indoors, indoor gardening humidity

About this Author

Melissa Lewis has been a professional writer since 2005. Her work has appeared in various online publications. A former elementary classroom teacher and media specialist, Lewis is also a script writer, with a movie script, "Homecoming," she co-wrote currently in production. She holds a Bachelor of Arts in psychology.