Let us try to understand what humidity and transpiration are before knowing whether plants like humidifiers.
Humidity is the amount of water vapor held in the air. Humidity is important for plants to make photosynthesis. So, lesser humidity impacts plant growth.
Transpiration is the loss of water from a plant via leaves, stems, and flowers in the form of water vapor.
When there is a lot of water vapor already present in the air, the rate of water evaporation slows down. So, humidity directly affects transpiration.
Certain plants like Cacti and succulents, which grow in dry areas don’t prefer humid conditions. Whereas tropical plants thrive in humid conditions.
If you are growing tropical plants indoors, you need to provide more humidity which can be achieved using a humidifier.