7 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.

TaoTronics Humidifiers, 4L Cool Mist Ultrasonic Humidifier...
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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-degree 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

TaoTronics Cool Mist Humidifier

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  • 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 a 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 4 litres, providing cool moisture for up to 15 hours in a 500 square feet room. At 3.52 pounds, it is among the most lightweight humidifier on 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 that can set the growth room’s moisture level from 1 to 24 hours. Plus, the unit comes with an auto shut-off functionality.

The TaoTronics Cool Mist Humidifier’s nozzle 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 odourless 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

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  • 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 Homasy Cool Mist Humidifier’s capacity is one of its notable features, especially the 4.5-litre 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 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 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.

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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.

Levoit Cool Mist Bedroom Humidifier

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  • 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.

Pure Enrichment B013IJPTFK MistAire Ultrasonic Cool Mist Humidifier

Pure Enrichment® MistAire™ Ultrasonic Cool Mist...
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  • Lightweight and portable design
  • 360-degree mist nozzle
  • Thin mist with a high moisture level
  • Easy to assemble with a detailed instruction manual
  • Quiet and comfortable operation
  • Valuable add-ons
  • 5-year warranty

What We Like

With ultrasonic cool mist technology, Pure Enrichment can moisture the air for up to 16 hours per refill without noise disturbance. 

Each unit has a built-in automatic mechanism to turn off the power when the water tank is low or when users remove the tank.

The 360-degree nozzle enhances the product’s flexibility by enabling the mist direction adjustment. The easy-to-use settings allow users to choose the speed. 

During night time, users can set it to low speed to preserve the plants. The night light brings a relaxing glow to the garden atmosphere.

For every purchase, the user will get a disk cleaning brush and power adapter, a value deal for these accessories.  This product is the best humidifier for beginners, thanks to the detailed instructions.

Pure Enrichment ensures a great customer experience with a 5-year warranty and fast customer service.

What Can Be Improved?

Despite the removable water tank, the 1.5-liter capacity can run out quickly. 

Users also need frequent cleaning to avoid mold in the internal parts.


BONECO W200 Large Room 2 In 1 Whisper Quiet Humidifier Air...
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  • Dual function with energy-efficient operation
  • Ultrasonic technology with no noise disturbance
  • Essential oil container
  • Automatic mechanism for turning off when water tank is low
  • Can use the dishwasher to clean the parts
  • 1-year warranty

What We Like

BONECO Air Washer stands out by providing moisture while filtering particles, such as dust and pollen, in the air. The dual function guarantees a fresh and clean atmosphere. 

Compared to other products in the same tier, BONECO consumes less energy, maximizing the capacity. This plant humidifier turns off automatically when the tank is empty.

Users can choose between the Day and Night modes according to their needs. Day mode ensures the air filtering effect while utilizing the energy. Night mode, on the other hand, maintains moisture at a quiet operation.

Users can place the lightweight unit conveniently anywhere in the garden. For indoor applications, users can add essential oil in the built-in container to give soothing air. Moreover, the parts are easy to clean. Users can save time by placing them in the dishwasher.

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Every purchase comes with a 1-year warranty to ensure product quality.

What Can Be Improved?

After receiving the product, users will need to assemble the parts manually.

Honeywell B07GRGW3SY Designer Series Cool Mist Humidifier

Honeywell Designer Series Cool Mist Humidifier, Black
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  • Compact build and stylish design
  • Easy to install
  • Thin cool mist
  • Essential oil container
  • Hassle-free cleaning session
  • Ultrasonic quiet operation

What We Like

This cold mist humidifier comes in a convenient handle at the top for easy transport. Users can place the compact unit anywhere in the grow room, especially in areas that need a high humidity level.

With 100 years of history, Honeywell offers the brand signature technology in each unit built.

This feature allows the diffuser to provide a light and thin cool mist, providing enough moisture to keep the plants hydrated.

Users can control the balanced humidity level to avoid decreasing the soil quality. You can also leave the operation running until the built-in lights signal the timing for water refills.

Honeywell is also the best humidifier for the bedroom with the fragrance oil container. Users can add their favorite essential oil to enjoy a relaxing atmosphere. 

For the cleanup step, users can remove each part quickly and wash them with soapy water.

What Can Be Improved?

During the first week using the product, you may experience the smell of plastic. But worry not, as the odor will fade away rather swiftly.

Another minus point is that users need to pour distilled water into the tank. Otherwise, the diffuser will turn minerals in the water into white residues at the bottom of its tank.

Magictec B08591YCSH Cool Mist Humidifier

Cool Mist Humidifier, Magictec 2.5L Bedroom Essential...
15,168 Reviews
Cool Mist Humidifier, Magictec 2.5L Bedroom Essential...


  • Large area coverage
  • Minimal design for various landscapes
  • An automatic mechanism for adjusting mist direction
  • Durable material
  • Compact build
  • Easy for cleaning

What We Like

The nozzle will adjust the mist’s direction to specifically cover the dry area while avoiding spots with high moisture. This feature makes Magictec the best cool mist humidifier because it keeps the plants healthy and avoids mold, mushy soil.

The durable ABS material can withstand all climate conditions, whether in the grow room or in the open space.

The minimal design can blend in any landscape and can also fit in small spaces. If users place the unit inside the house, it will fit neatly on the coffee table.

Each full water tank can cover a wide range of up to 3,000 square feet. The inside of the tank has arrows to instruct the water level and correct tank positioning. Users can remove the parts with simple steps for cleaning sessions.

The system turns off when the water level is low, which is 24 hours after a refill.

What Can Be Improved?

The minor crackling sound when the unit operates.

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.

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 vapour, 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 into the atmosphere.

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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 plant humidifier’s capacity 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.

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

In terms of the 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 operation between refills is good enough.

Noise Level

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

Water Tank Size

The plant humidifier’s water tank size 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.


Aside from the moisture amount that a humidifier can provide, it is also essential to consider the device’s location 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 maneuvre 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 moisture levels 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.

Frequently Asked Questions

Are humidifiers good for plants?

Humidifiers provide moisture better than the regular water trays in the garden. 
They can operate for 12 to up to 24 hours between refills. Plus, the closed water tank can avoid becoming a potential place for insects to inhabit.
Depending on the manufacturer, some products may include advanced functions. One of the recommended functions for users is the responsive nozzle. 
This nozzle detects moisture level in the area, ensuring the mist covers low level spots, while adjusting suitable moist for the high level parts.
This type of product is the best humidifier for winter, when plants need a balanced moisture level.

When is the best time to use humidifiers for my plants?

The best time is in the morning until lunchtime as the plants still have sunlight that encourages the evaporation of excess humidity. This feature can prevent mold and preserve the soil quality.
In certain climates, the night time may have significantly lower temperature than the day. Users can switch to the best warm mist humidifier as the solution.
The warm steam has an additional benefit of killing germs and bacteria. On this flip side, the water tank runs out quicker than cool mist humidifiers.

Is a humidifier bad for succulents?

Similar to the need for water, succulents require enough moisture to stay healthy without damaging the roots.
Each type of succulent needs a different moisture level. Most succulents can grow well in an environment with an 80% to 100% humidity level. Users need to identify the type of succulent to choose the suitable product.
The climate condition also has an important role. If the climate already brings 60% humidity to the grow room, then the humidifier only needs to operate on an average of 3 times a week.
Another factor is the plant growth stage. A humidifier works best for small seedlings, while it needs adjustments for mature succulents.


Our top pick for the best plant humidifier is the TaoTronics Cool Mist Humidifier for its enormous water tank capacity and 30 hours of 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 2024-05-04 / Affiliate links / Images from Amazon Product Advertising API

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Jill Sandy

I am a sustainable focus gardener. I love decorating my home backyard with beautiful landscape design and creative garden care techniques I develop myself.