Best Humidifier for Plants Review and Buying Guide

Adding humidity to the grow room helps conserve plant moisture, and for that, it’s necessary to have the best humidifier for plants.

A quality humidifier helps maintain the ideal humidity levels inside the grow room so plants can thrive. Otherwise, low humid places will be stressful for the plants and cause them to wilt away.

Our top pick for the ideal humidifier for plants is the TaoTronics Cool Mist Humidifier, with its smart features like a built-in humidity sensor. It ensures that the room gets only the right amount of air moisture, not less or more, which are both stressful to plants.

The unit also comes with a 360-degrees adjustable nozzle for even moisture distribution inside the grow room without fogging issues. The water tank of the humidifier is large enough to last overnight before needing a refill as well. Plus, it has an efficient ultrasonic design for whisper-quiet operation.

Best Humidifier for Plants Buying Guide

Consider the types and features of the best plant humidifier depending on the grow room needs and moisture requirement.

Best Humidifier for Plants Review and Buying Guide

Types of Humidifier for Plants

High humidity levels can cause dust mite attacks, mold build-up, and bacterial growth. Meanwhile, low humidity encourages bacteria and virus spreading and will dry out plants quicker.

Some humidifiers provide cold moisture, while others increase warm humidity. The wrong humidity level is harmful to plants, so it is vital to choose the best type of humidifier.

Cool Mist Humidifier

This type of humidifier provides moisture at room temperature, which prevents any accident involving boiling water. Cool mist humidifiers also require less electricity compared to other humidifier types.

Warm Mist Humidifier

This type of humidifier heats water to provide a room with warm moisture. It is ideal for fighting bacteria and mold in plants or inside the grow room. Warm mist humidifiers are also most useful for plants during the winter season.

It features a heating chamber that boils the water to produce purified and visible mist. This type of plant humidifier is usually noisy as it creates a gurgling sound while boiling the water.

Best Humidifier for Plants Review and Buying Guide

Evaporative Humidifier

This type uses airflow to build and produce water vapor, which provides an invisible moisture output inside the grow room. It features a wicking filter and a fan that helps water evaporate quickly, which is often noisy.

Evaporative Humidifier also requires frequent cleaning and maintenance for best effect.

Ultrasonic Humidifier

This type of humidifier is the cheaper option for keeping the air inside the grow room moisturizes. It utilizes vibration to send visible and cool mist in the atmosphere.

Ultrasonic humidifiers are also the quietest in the bunch, which won’t cause any noise or disturbance.

The only downside of ultrasonic humidifiers is it tends to produce high levels of humidity than needed.

Best Humidifier for Plants Review and Buying Guide

Room Size/ Humidifier Capacity

The capacity of the plant humidifier should depend on the room size or the required humidity level of the plants inside the room. Cacti and other desert plants usually require lower humidity levels than most plants that need 60% humidity.

A good rule of thumb when choosing the best humidifier capacity depending on room size is a small humidifier for a 300 square foot area. A room between 400 to 500 square feet area will need a medium-sized humidifier, and any more space than that will require a high-capacity humidifier.

In terms of water tank capacity of a humidifier for plants, a 3-gallon tank can cover an 800 square feet room. Meanwhile, a 9-gallon humidifier provides enough mist for a 2000-3200 square feet area, while a 12-gallon model covers up to 3800 square feet.

Lastly, the capacity of the humidifier will determine its run time. 12-hour or 24-hour of operation between refills is good enough.

Noise Level

Humidifiers feature a rotating fan for discharging moisture inside the room, which makes the machine a bit noisy. However, some models feature quiet operation like most ultrasonic humidifiers, which is the best option.

Water Tank Size

The water tank size of the plant humidifier will determine how often it needs a refill in a day. Compared to typical humidifiers for humans, those used in a grow room tends to dispense moisture at a higher rate.

In that case, a humidifier with a larger water tank is ideal as it requires less refill frequency.

Portability

Aside from the moisture amount that a humidifier can provide, it is also essential to consider the location of the device inside the grow room. Placing the device too near to the plants can cause wilting.

In this case, a mobile and portable plant humidifier is the best option. This way, it’s easier and quicker to put in a place where the humidifier can be most beneficial to the plants. The lighter the humidifier is, the easier it is to maneuver as well.

Built-In Humidistat

A built-in humidistat in plant humidifiers automatically shuts off the device once the room reached the pre-set humidity levels. This feature prevents the humidifier from providing high levels of moisture than necessary, which causes condensation droplets on room surfaces and plants.

Otherwise, there has to be a separate hygrometer for tracking the humidity level and then turning the humidifier off manually.

Cleaning and Maintenance

All types of humidifiers will work best when regularly and adequately cleaned. Some are easier to maintain and clean than others, like cool mist humidifiers compared to evaporative and warm mist units.

Extra Features

Another feature that is useful for a plant humidifier is an auto shut-off functionality. It avoids electricity wastage or accidents as it automatically turns off once the tank’s water level is low.

Best Humidifier for Plants

TaoTronics Cool Mist Humidifier

Homasy 4.5L Cool Mist Humidifiers, Top Filling Humidifiers...
2,616 Reviews
Homasy 4.5L Cool Mist Humidifiers, Top Filling Humidifiers...
  • POWERFUL HUMIDIFIER - The humidifiers is embedded with...
  • ULTRA-QUIET & NIGHT SLEEP MODE - Homasy ultrasonic...
  • EASY TO CLEAN & REFILL - Homasy cool mist humidifier...

Features:

  • Can cover a room with 100 to 320 square feet area
  • The water tank can hold up to 4-liters of water
  • Can last for up to 12 to 30 hours of operation on full tank depending on the mist output setting
  • Efficient ultrasonic design
  • Doesn’t leave white dust on surfaces and plant leaves
  • With multidirectional discharge option for proper and even moisture supply inside the room
  • 360-degrees rotatable nozzle
  • Whisper-quiet function
  • Built-in humidistat display with 3 mist settings
  • Auto shut-off feature when the water level is low

What We Like

The TaoTronics Cool Mist Humidifier is a good value for money with its large water capacity and extra built-in features. The water tank can hold up to four liters, which can provide cool moisture up to 15 hours in a 500 square feet room. At 3.52 pounds, it is among the most lightweight humidifier in the market.

Another selling point of the TaoTronics Cool Mist Humidifier is its LED display, which indicates the room’s humidity level. It also features a built-in timer than can set the moisture level inside the grow room from 1 to 24 hours. Plus, the unit comes with an auto shut-off functionality.

The nozzle of the TaoTronics Cool Mist Humidifier can rotate up to 360 degrees, plus the multidirectional mist discharge provides even moisture distribution. This humidifier also features an ultra-silent operation for comfortable sleep, thanks to its ultrasound technology.

The humidifier comes with a built-in micro cartridge that ensures the moisture produces is pure and odorless air free from all microorganisms.

What Can Be Improved?

The multidirectional and rotatable nozzle is excellent for even mist distribution in a room, but this design makes the unit difficult to clean.

It poses a high risk for bacteria build-up when the humidifier doesn’t get cleaned properly. The design and position of the water tank also make it challenging to remove for refills.

Homasy 4.5L Cool Mist Humidifier

Homasy 4.5L Cool Mist Humidifiers, Top Filling Humidifiers...
2,616 Reviews
Homasy 4.5L Cool Mist Humidifiers, Top Filling Humidifiers...
  • POWERFUL HUMIDIFIER - The humidifiers is embedded with...
  • ULTRA-QUIET & NIGHT SLEEP MODE - Homasy ultrasonic...
  • EASY TO CLEAN & REFILL - Homasy cool mist humidifier...

Features:

  • Convenient one-touch operation
  • Top-fill design for easy and quick refilling and cleaning
  • 3-level adjustable mist settings
  • Compatible with essential oils and can work as a diffuser
  • Water tank capacity of 4.5 liters, enough for providing moisture in a large room all night
  • 28dB quiet operation for comfortable and undisturbed sleep
  • Up to 30 hours working time depending on mist settings
  • Up to 280-ml per hour mist volume output

What We Like

The capacity of the Homasy Cool Mist Humidifier is one of its notable features, especially the 4.5-liter water tank capacity. It’s a powerful humidifier that can provide 280-ml mist output per hour to cover large grow rooms of up to 538 square feet areas. Depending on the mist setting chosen, this unit can last up to 30 hours of continuous operation in between refills.

Maintaining the 40% to 60% humidity levels in grow rooms are vital, and that is possible thanks to Homasy’s 3-level adjustable mist settings. The best part about this unit is it can go from a humidifier to a diffuser. It is compatible with all kinds of essential oils to add fragrance and other benefits to the atmosphere.

Restful sleep is also possible with the Homasy Cool Mist Humidifier, thanks to its cutting-edge 28-dB whisper-quiet operation. It also comes with an auto shut-off feature to prevent overheating of the unit once the tank runs out of water.

The humidifier produces healthy moisture with its built-in masterbatch material. It efficiently prevents stain growth and dust build-up. The top-fill design of the unit also makes it easy to refill and clean.

What Can Be Improved?

Although the Homasy Cool Mist Humidifier comes with impressive features, it lacks a built-in humidistat, which would have been a bonus. Without that feature, the unit tends to produce high humidity levels that can produce white dust on room surfaces sometimes.

Geniani Top Fill Cool Mist Humidifier

GENIANI Top Fill Cool Mist Humidifiers for Bedroom &...
8,197 Reviews
GENIANI Top Fill Cool Mist Humidifiers for Bedroom &...
  • 2-in-1 HUMIDIFIER AND DIFFUSER. Fill your room with your...
  • SMART MODE. Maintain a healthy humidity level automatically...
  • TOP FILL HUMIDIFIER. Refilling has never been easier! Simply...

Features:

  • Compatible with essential oils
  • With smart mode for the built-in humidity sensor
  • Three manual moisturizing speed settings
  • Top-fill design for easy refill and cleaning
  • 38dB quieter operation for sound sleep
  • Auto shut-off once the water tank is empty
  • Water tank capacity up to 4-liters
  • Extensive room coverage up to 220 square feet areas
  • Up to 18 hours of working time depending on mist settings
  • Pleasant LED night light with turn-off option

What We Like

This unit from Geniani is a 2-in-1 humidifier and diffuser, which is a bonus. It is compatible with all kinds of essential oils for providing fragrance and moisture inside the grow room.

The 4-liter water tank capacity of the Geniani Top Fill Cool Mist Humidifier means it doesn’t need a frequent refill. This unit can provide room moisture up to 220 square feet area for up to 18 hours, depending on the moisture settings.

There are also 3 manual moisture speed settings in the unit through its simple touch-button panel. This humidifier also features a smart mode, using its built-in humidity sensor for auto shut-off once the room reaches the pre-set humidity level. The auto shut-off feature also works when the water tank gets empty, preventing overheating of the unit.

If the grow room is near the bedroom, there’s no problem with a buzzing noise with the humidifier’s 38db quiet operation. It has a soothing built-in night light with a shut-off option as well. The top-fill design of this unit makes refilling and cleaning convenient and quick.

What Can Be Improved?

The 4-liter capacity of the Geniani Top Fill Cool Mist Humidifier limits the need for refills. However, it has one drawback, the heaviness of the unit. It weighs 4.4 pounds, challenging to carry when you need to change its location in the grow room.

Geniani Ultrasonic Cool Mist Humidifier

Ultrasonic Cool Mist Humidifier - Premium Quality 2L Water...
853 Reviews
Ultrasonic Cool Mist Humidifier - Premium Quality 2L Water...
  • COOL MIST HUMIDIFIER 2L will let a stream of fresh air into...
  • T-SPRAYING TECHNOLOGY. Water is converted into a fine mist...
  • TOUCH CONTROL. Humidifiers are easy to control - with...

Features:

  • T-Spraying Technology ensures no wetting on the floor
  • Water tank capacity of 2-liters
  • Touch-control operation with 3-moisture speed settings
  • Built-in LED night light for better sleep
  • Built-in timer for auto shut-off on a pre-set time
  • 12 to 20 hours operation depending on mist settings
  • Antibacterial Technology to protect and suppress mold growth
  • Ultrasonic whisper-quiet technology for undisturbed sleep
  • Filter free action, no need to buy and replace
  • 360-degrees adjustable mist nozzle

What We Like

One of the best things about the Geniani Ultrasonic Humidifier is its compact design yet powerful mist production. It’s a stylish and good-looking humidifier to fit any room, and the 2-liter water tank capacity can dispense fresh air for 12 to 20 hours. Controlling the unit is also straightforward with its touch-control operation.

There are also three moisture settings available to adjust the mist level, depending on what the grow room needs. The Geniani Ultrasonic Humidifier is a smart way to moisturize the room even at night with its whisper-quiet operation. It also comes with a night light feature and an automatic timer, both with shut-off options.

The 360-degrees adjustable mist nozzle provides even moisture distribution inside the grow room. The humidifier also features an Antimicrobial Technology for providing only the cleanest and purest air by suppressing mold growth in the unit.

Cleaning and maintaining the humidifier is also a breeze with its filter-free operation. There’s no need to spend money on new filters. Refilling the water tank is easy as unscrewing the cap as well.

What Can Be Improved?

When it comes to features and functions, the Geniani Ultrasonic Humidifier has a lot to offer, but the plastic material is a bit flimsy. The top cover of the unit is thin plastic and can get easily broken. The cord of the humidifier could also be a bit longer.

Levoit Cool Mist Bedroom Humidifier

LEVOIT Humidifiers for Bedroom, Cool Mist Humidifier for...
3,100 Reviews
LEVOIT Humidifiers for Bedroom, Cool Mist Humidifier for...
  • 2-in-1 Humidifier&diffuser: The Dual 100 acts as both a...
  • Top-Fill Design: For easy refills and cleanup, simply remove...
  • Safe and Reliable: BPA free ETL listed and CA65 tested make...

Features:

  • Built-in humidity sensor for comfortable room moisture levels
  • 2-in-1 humidifier and essential oil diffuser
  • Top-fill design with removable lid for hassle-free refill and cleaning
  • 28dB whisper-quiet operation for undisturbed sleep
  • Spiral Air Duct Technology ensures no fogging in the room
  • Water tank capacity of 1.8 liters ideal for small to medium-sized rooms
  • 3-moisture speed settings
  • Auto shut-off with 8-20 hours run time depending on mist settings

What We Like

This Levoit unit does two works at the same time as a humidifier and an essential oil diffuser. It’s a 2-in-1 system that is compatible with different essential oils to add fragrance in the grow room.

The 3 adjustable mist settings of the unit are also an advantage. The moisture speed is accessible through a single push button for the best comfort and ease. Depending on the mist settings, the Levoit Cool Mist Humidifier can last up to eight to 20 hours between refills.

It has a 1.8-liter water tank capacity, enough to provide moisture inside a small to medium-sized grow rooms.

Another great feature of this unit is its Spiral Air Duct Technology, which ensures that there’s no fogging or condensation inside the room. It also comes with a built-in humidity sensor that auto shuts off the unit once the room reached the pre-set humidity levels.

The 28dB whisper-quiet operation of the Levoit Cool Mist Humidifier makes it the quietest humidifier there is. The top-fill design also makes water refills and cleaning a breeze. The lid is removable and easy to clean and maintain as well.

What Can Be Improved?

The only downside about this Levoit humidifier is its shoots moisture straight upwards. It could be better if the unit produces mist at an angle like other humidifiers.

Conclusion

Our top pick for the best plant humidifier is the TaoTronics Cool Mist Humidifier for its enormous water tank capacity and 30 hours operation. Its whisper-quiet function is also a bonus, including the efficient ultrasonic design and built-in humidistat with a display.

However, the ideal humidifier for plants will primarily depend on the grow room’s needs in terms of the unit type and its mist capacity.

Last update on 2020-10-28 / Affiliate links / Images from Amazon Product Advertising API

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Jill Sandy

Jill Sandy

Jill is a sustainable focus gardener. She loves decorating her home backyard with beautiful landscape design and creative garden care techniques she develops herself. You can reach her at jill@constantdelights.org

Chanh Ho (MD, MPH)

Chanh Ho (MD, MPH)

Chanh is our Head of Medical Review. He is a research physician at Oxford University Clinical Research Unit. After accomplishing the program of level 1 sub-specialty in Pediatrics, he was awarded the Chevening Scholarship for his Master’s degree of Public Health in the University of Edinburgh in 2019

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