House Plants/transpiration


I have 53 potted plants.  There are 3 hibiscus in 14" pots and the others are in 1 gallon nursery posts and smaller.  The house is 1800 sq ft and the plants are located in 4 different rooms.  Can these plants cause the humidity to be over 50%?  There is no water standing in the pots and no water in the trays.  Thank you.

Hi Linda,

I am not sure if you are concerned that the humidity in your home might rise above 50% or if you are trying to raise it above 50%.

In either case, your 53 plants are not enough to raise the humidity more than a few percentage points. In very dry winter air that is artificially heated, most of the water that transpires from leaf pores (stomata) quickly evaporates and will not make the air noticeably more humid. There would be  greater effect if virtually all floor and table surfaces were covered with plants and if there were lots of plants hanging throughout your home. In other words, if your home was like a greenhouse, then you would notice the increase in humidity.

If you want to increase humidity, pebble trays and humidifiers are more effective.

Please let me know if any of this is unclear or if you have any additional questions.

If this information has been helpful, please click the Rate Volunteer bar below and enter a rating and NOMINATION for me. I am a volunteer on this site so Ratings are the only compensation I receive for answering plant questions.

Need more information? Visit my website at:
A link to

or email me at or call me at 917-887-8601 (EST)
Will Creed, Interior Landscaper
Horticultural Help, NYC

Visit my website at: A link to  

House Plants

All Answers

Answers by Expert:

Ask Experts


Will Creed


I am the only expert in this category with professional hands-on experience and knowledge of all indoor plants. I can answer questions regarding light, water, fertilizer, repotting, pruning and humidity and temperature requirements. I can identify plant pests and provide information on safe, effective treatments. My answers are based on 35 years of professional experience and scientific research and are clear and easy to understand. I do NOT use search engines to find answers to your questions. If you read my previous posts here, you will get a good idea as to how thorough and professional my answers are.


I have over 35 years of professional indoor landscaping experience caring for plants in homes, offices, building lobbies, stores, restaurants, and other adverse environments. I have written extensively on the care of indoor plants, including a 260 page book. My specialties include Ficus trees, low light plants, repotting, pest control, and re-blooming holiday plants. Be sure to check my ratings and nominations to learn why I am the top-rated indoor plant expert. I am the only House Plant expert consistently ranked in the AllExperts Top 20.

BA, Amherst College

©2017 All rights reserved.