10 Best Humidifier for Plants – Top Picks and Reviews for 2021

There are a lot of people who like to grow indoor plants in their rooms. Some of us think that watering the plants is enough for the plants to thrive. But it is not correct.

If you ever visit a tropical area or botanical garden, you will notice that the air in those areas is quite humid. The reason behind it is that various types of plants need moisture and thrives more with different levels of humidity in the air.

 Dry air and also high humidity may destroy the indoor plants. So to add or to adjust the moisture in the air, you need the best humidifier for plants, as it will help the plants to develop more healthily.

Some of the Best Humidifier for Plants are noted down in this review for the healthy growth of the houseplants.

Top Picks of Humidifier for Plants :

1 Gal. tank, runs up to 70 hours, clean protection, aromatherapy tray
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1 Gal. tank, runs up to 70 hours, clean protection, aromatherapy tray
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Take a look at the comparison chart above. Although the article is short and you can easily finish reading the article, but the chart may be more helpful to have an idea about the best products currently available.

Reviews of the Best Humidifier for Plants 2021:

Well, you don’t need to be worried to choose the ideal humidifier for indoor plants from a large variety of selection. You can choose the best plant humidifiers from the following reviews.

1. Homasy 4.5L Ultrasonic Humidifier:

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The sleek and efficient Homasy’s cool mist ultrasonic humidifier is one the best humidifier for house plants as well as any large space. It comes with an eye-catching design. The internal construction is also excellent as all the key parts are made of high-quality materials and sturdy stainless steel.

Certainly, this is not a very big humidifier; only 4. 5 L is quite effective for your indoor plants. The mist output is approximately 280ml/h. With the low mist setting, it can run up to 30 hours. You will never feel noisy with this humidifier because of its ultra-quiet operation.

You will like its ‘Night Sleep Mode’ feature that will allow you to sleep comfortably. By pressing the touch button for 3 seconds, the machine will go into sleep mode when the light will be off and mist spraying will be continuous.

This best humidifier for houseplants is essential oil compatible. No doubt, this feature improves your sleep quality and creates a soothing environment. The humidifier is very effortless to refill and clean when need. Auto shut-off when it runs out of necessary water gives it true perfection.


  1. Features 4.5 L, easy to fill the tank.
  2. Runs maximum for 30 hours continuously.
  3. Comes with ultra-quiet and ‘night sleep mode’.
  4. Feature to add essential oil enhances its efficiency.
  5. Mist level can be adjusted easily.


  • There is no noticeable drawback.

Read also: Homasy Cool Mist Humidifier Review (4.5L)

2. Pure Guardian H965AR :

Pure Guardian H965AR Ultrasonic Cool Mist...
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Another best humidifier for plants is the Pure Garden’s H965AR ultrasonic humidifier. It includes a 1-gallon tank that can be filled with water easily. Budget-friendly, this humidifier comes with ultrasonic technology to disperse soothing cool mist.

The amazing humidifier was best humidifier for plants 2019 & 2020. It is best for medium-sized rooms, and it can run up to 70 hours. The low and high output settings of the humidifier help to adjust the humidity level. Silver clean protection is also added in the tank to reduce the growth of mildew and mold from the tank’s surface.

This ultra-quiet humidifier provides ultra-fine mist in the air. You can use this humidifier in small to medium-sized rooms. There is a refill indicator light that lets you know when the water level is low. When the water tank becomes empty, the humidifier automatically shuts off.

Moreover, it features an aromatherapy tray that helps to create a relaxing environment with your favorite essential oil. This sleek humidifier comes with a 3-year warranty.


  1. 1-gallon tank with 70 hours run time.
  2. Features a silver clean protection to fight against bacteria.
  3. Best for small and medium-sized grow rooms.
  4. Ultra-quiet.
  5. 3-year warranty.


  • No carry handle included in the tank.

3. TaoTronics 4L Ultrasonic Humidifier:

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The durable and safe TaoTronic’s cool mist humidifier can maintain an ideal humidity level for the plants. It has an automatic humidity monitoring system with an LED display to show the working status of the humidifier.

The humidifier comes with a 4-liter tank capacity and can run up to 12-30 hours with a full tank. It has a quiet operation as it produces less than 38 dB of noise. There are three mist levels from which you can choose your desired humidity level for your plants.

The microporous filter cartridge helps in eliminating bacteria and bad smell from the water to disperse fresh and pure air for the plants. Its 360-degree mist nozzle disperses cool mist across the room equally. The built-in handle of the humidifier helps in filling the tank with water and cleaning it.

It is quite safe to use as the humidifier automatically shuts off when the water level is down or when it becomes empty. This humidifier is best for medium-sized rooms.


  1. Large 4L of water tank capacity with 12-30 hours run-time.
  2. Quiet operation.
  3. Easy to clean and refill.
  4. Three mist level output is available.
  5. Timer and auto shut off features included.


  • It takes up a lot of space.

4. NovoLido Mini USB Humidifier :

PureGuardian 10L Output per Day Ultrasonic Warm...
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If you’re looking for a mini cute-sized USB humidifier, then NovoLido’s mini USB humidifier will be the best option. It is lightweight and ideal for carrying it everywhere you want. You will simply need to connect the USB port with a power source and the humidifier will serve you efficiently.

The mini humidifier for plants is designed with a two-time setting. When you click the button for one time, the mist will be sprayed continuously for 4 hours. Two clicks on the button with an interval period allows the humidifier to run for 8 hours. To ensure the better quality of the device, this humidifier will be turned off automatically at a mentioned time.

This NovoLido humidifier is actually the best small humidifier for plants; there are several reasons behind this. It is a personal-type humidifier, comes with nano-spray technology for fine mist spraying. Worthy to mention that it has 7-Colors Light Mode that creates a romantic environment. Moreover, this is an extra efficient noise-free humidifier.

The humidifier is featured with one-button control and made for easy operation. Its effortless mist adjustment helps to use the humidifier with ease. It is suitable for your plants that grow in small space, car, desk, and travel as well.


  1. Mini humidifier, easy to handle.
  2. 2 mist model, simple adjustment.
  3. 7-color mode light, romantic atmosphere.
  4. One button for controlling everything.
  5. 3-year warranty.


  • Not suitable for a big room.

5. AIRCARE 831000 Humidifier:

LEVOIT Humidifiers for Bedroom Large Room Home, 6L...
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The plants can enjoy the perfect humidity level with the AirCare’s space-saver humidifier. This large humidifier for plants comes with a large 6-gallon capacity water tank that can fill your whole grow room with humidity. This humidifier can disperse pure air for a maximum of 70 hours in a full tank.

The evaporative technology helps to disperse 40% to 60% humidity into the dry air and lets you save up to 20% on the electricity bill. You can choose your desired humidity level from the three fan speeds.

The humidifier automatically shuts off when the water tank becomes empty, or when it reaches the desired humidity level. The thick wick filter with trap max filter technology helps to absorb all the airborne particles and minerals from the water.

Plus, it comes with indicators, one for refilling the tank and one to check the filter. The large humidifier also includes a control panel with simple push buttons. With ease, you can fill the tank with water.

Moreover, the space-saver humidifier includes roller casters for easy transportation and placement and is backed up with a 2-year warranty.


  1. Large 6-gallon water tank.
  2. Runs for 70 hours.
  3. Disperses germ-free moisture into the air.
  4. Adjustable fan speed settings.
  5. 2-year warranty.


  • Medium and high fan speed settings are quite loud.

6. Honeywell Humidifier HCM-710:

The unique Honeywell’s HCM-710 cool-mist humidifier fills the room with invisible and soothing moisture. This humidifier is easy to fill with water, like watering the plants.

This best humidifier for indoor plants contains a one-gallon tank that runs up to 36 hours at low-speed, which means you don’t have to refill it every two hours. The humidifier comes with two speed functions, high and low, to adjust the moisture output according to the plant’s needs.

There is an illuminated water window that helps you to know the amount of water left in the tank without any trouble. Moreover, it comes with a wicking filter that captures the dirt and minerals from the water and prevents white dust while using hard water.

This humidifier for indoor plants is recommended to use distilled, and clean water if you want to use the filter for a long time, otherwise, you have to replace the filter within one or two months. The humidifier is simple to clean as it comes with an easy-to-clean wiping surface. It is best for medium and small-sized rooms.


  1. Large one-gallon tank.; Runs for 36 hours in one filling.
  2. Illuminated water window to see the water level.
  3. Easy to fill, clean, and use.
  4. Self-regulating evaporative system.
  5. 3-year warranty.


  • Bright blue LED light.

7. Vicks Ultrasonic Humidifier :

Fill your grow room with moisture with Vick’s ultrasonic humidifier. The coffee maker-shaped humidifier contains a 1.5-gallon tank that can be filled with water very easily, and it can run for 24 hours per filling. The humidifier emits ultra-fine and refreshing mist to moisten the dry air.

The filter of the indoor plant humidifier captures minerals and pollutants from the hard water and releases pure air. If the tank filter gets contaminated with too much dirt, then you have to replace it. So it is recommended to use distilled water instead of hard water.

The dial on the humidifier helps to direct the mist. humidity machine for plants is easy to clean and use. It is very quiet and also helps to relieve congestion and coughing too. There is a variable mist control that helps to regulate the fine-tuning mist output.

This humidifier is best for medium to large-sized grow rooms. Even though the humidifier has a 1-year warranty, you can use it for a long time if used with proper care.


  1. Large 1.5-gallon tank.
  2. Runs for 24-hour max on a single filling.
  3. Best for large rooms.
  4. Features a variable mist control to adjust humidity level.
  5. Quiet operation.


  • No auto shut-off system.

8. Ideal-Air 700860 Commercial:

Avalon Premium Cool Mist Humidifier with...
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This commercial-grade, no doubt, one among several best humidifier for indoor plants comes with a powerful and industrial-grade motor, which can run for hours. The humidifier can be attached to the water supply, which removes the hassle of refilling the water tank.

The multi-directional fogging head included in it helps to disperse dry fog all over the room. The maximum humidity output the humidifier can deliver is 0.4 gallons per hour. It has a constant output without any settings for adjustment.

The automatic humidifier for plants runs at 62 dB, which is quite loud. But if the grow room is far from your bedroom, then it is okay. For maximum fogging, you can also remove the fogging head from the unit. The reservoir pan assembly should be cleaned regularly to remove the dirt.

Moreover, the whole unit should also be cleaned once in three months to remove the calcium build-up deposits. It can cover 160-320 sq ft rooms, depending upon the ceiling height and humidity requirement. If you want a humidifier that can run for days, then this humidifier is a perfect choice.


  1. Industry-grade motor.
  2. Connects to the water supply.
  3. Max 75 pints output per day.
  4. Multi-directional fogging head included.
  5. Easy to use.


  • Loud operation.
  • Speed cannot be adjusted.

9. ASOM Humidifier and Aroma Oil Diffuser:

REMEDIES Ultrasonic Cool Mist Humidifier, Aroma...
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If you are looking for an effective humidifier to fill your medium-sized grow room with moisture, then ASOM’s ultrasonic cool mist humidifier is a perfect choice. This humidifier comes with seven color LED night lights from which you can choose your favorite one.

The stone filter of the humidifier helps to disperse pure and cool mist. It runs for 14 hours continuously as it comes with a 2.8-liter water tank capacity. The most useful feature of this humidifier is the control knob that lets you adjust its vapor flow.

The 360-degree mist nozzle helps to disperse the cool mist across the whole room. Moreover, it comes with a dispensing tray. All you need to do is soak the sponge with your favorite oil, place it on the tray, and enjoy the aroma as well as the pure mist.

This compact humidifier shuts off automatically when the tank is removed from the humidifier and when the water level becomes low. It is perfect for a medium to small-sized grow rooms. This light humidifier is easy to fill with water and can be cleaned quickly too.


  1. 2.8-litre tank capacity.
  2. Runs for 14 hours continuously.
  3. Disperse cool mist around the room equally.
  4. Aroma dispenser included.
  5. Automatically shuts-off when the water level is low.


  • Might Leak.
  • Small water tank.

10. Horticat U80 Ultrasonic Commercial Humidifier :

Ideal-Air Commercial-Grade Humidifier GSH75, 75...
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Horticat’s U80 ultrasonic commercial humidifier comes with unique features and provides maximum mist air to make a comfortable environment for the plants. It can be mounted on the wall for a high level of humidity.

This unit comes with a humidistat, which allows keeping the humidity level in control. You can connect the humidifier with the water supply and don’t need to worry about refilling the tank.

It emits clean and pure mist all over the room with 80 pits output per day. The unit provides ultra-fine mist, which causes no mess on the floor.

It has a quiet operation and also can be cleaned, without any hassle. This humidifier is best for large grow rooms or gardens as it can run continuously for hours and even days.


  1. Connects to the water supply.
  2. Boasts 80 pits mist output per day.
  3. Quiet operation.
  4. No mess ultra-fine mist.
  5. Easy to use and clean.


  • Expensive than other humidifiers.

Benefits of Plant Humidifiers:

Plants, while inhaling carbon-dioxide, release moisture through the pores of their leaves. When the air is dry and the plants keep on loosing moisture, the leaves of the plants become dry and dull quickly.

Watering the plants every day will help them a little, they require an adequate amount of moisture in the air to absorb and to grow. 

When the temperature becomes low, the amount of moisture in the air, becomes less too, which means the humidity level decreases. So when the humidity level becomes low, the plants want more moisture in the air to absorb. And that moisture is given to them with the help of a humidifier.

indoor plant humidifiers add moisture to the dry air. They release warm and pure mist into the air, which is then absorbed by the plants. Like humans, plants also can absorb a limited amount of moisture.

The humidity level should not be too high or too low compared to the temperature. And for this, the humidifiers come with mist output control settings to adjust the humidity level according to the air temperature.

humidifier for tropical plants also eliminates impurities, dirt, and other harmful particles from the air by dispersing clean mist in the air.  Plants flourish more in a pleasant and healthy atmosphere, and in creating such an environment, the humidifiers play an essential role. Moreover, humidifiers help to create a healthy environment for us too.

Things to Consider While Buying A Humidifier for Plants:

Size of the Room: This is one of the most significant factors when purchasing a humidifier for the plants. You should choose a humidifier according to the size of the grow room. A small humidifier cannot cover a large room, and the plants won’t get the required moisture for their growth.

And if you buy a large humidifier for a small room, then the humidity level will be too high for the plants. The room should be covered with a 50%-60% humidity level for the growth of the plants.

 So if your room is 300 square feet or smaller than that, then you require a small plant humidifier. A medium-sized humidifier for a greenhouse is needed if the room is about 350-450 sq.ft and when the room is 500 sq.ft or more, then you need a large-sized humidifier.

Types of Humidifiers: There are various types of humidifier available in the market that comes with different features. Cool mist humidifiers disperse cold moisture while warm mist humidifiers release warm mist into the air.

The other types of humidifiers are ultrasonic and evaporative humidifiers. Both use different techniques to discharge moisture into the air.

You need to choose the right type of humidifier for your plants so that they won’t dry out or get affected by bacteria or mold build-up.

Water Tank Capacity: Small humidifiers have a small tank, and large-sized humidifier comes with large water tanks. If you want your humidifier to run for a long time, then a large-sized water tank will be preferable.

And large tanks are also better as they don’t have to be refilled too often. Some large humidifiers can be connected to the water supply and don’t need to be refilled frequently.

Noise: There are many humidifiers, which are helpful but are quite noisy. If you dislike loud humidifiers, then you need to purchase a humidifier that operates quietly. If the grow room is far from your bedroom, then noisy humidifiers won’t be a problem.

Filters: Few humidifiers come with efficient filters. If you use hard water, then those filters have to be replaced every 2/3 months as they become contaminated with too much dirt quickly.

So if you want your filter to stay clean and to run for a long time, then you should use distilled water. On the other hand, if you don’t want the hassle of replacing the filters after a few months, then you are recommended to purchase a filter-less humidifier.

Speed Settings: Some of the humidifiers are featured with only two-speed mist output settings, high and low. Most of the people want more speed settings to adjust the moisture and to keep the humidity level of the room moderate, which cannot be achieved by the two-speed settings.

In a high setting, the humidifier will emit more moisture while in a low setting, it releases less moisture in the air. As a result, the humidity level sometimes becomes too high or too less for the plants.

So a humidifier with a three-speed mist output setting, high, medium, and low, is better as you get the chance to keep the humidity level moderate.

Types of Plant Humidifiers:

There are different types of humidifiers with distinct features for plants and users generally ask what type of humidifier is best for plants.

The answer is described below. Different types of plant humidifiers use diverse technologies to add moisture into the air and to increase the humidity level.

Warm Mist Humidifier: warm mist humidifier for plants heats water, then turns them into water vapor, and releases warm mist into the air, to increase the humidity level. This humidifier is the most common one.

Cool Mist Humidifier: Cool mist humidifier for plants comes with filters to remove dirt and impurities from the water and disperses germ-free cool mist into the air. This humidifier uses less electricity than a warm mist humidifier and operates for a long time.

Evaporative Humidifier: The humidifier utilizes airflow to create vapor. The humidifier contains a fan that pulls and blows the pulled air over a wet wick and turns them into mist. Then the mist is released into the dry air.

Ultrasonic Humidifier: The most popular type of humidifier is the ultrasonic humidifier. With the help of the ultrasonic vibrations, it steams the water and creates extra-fine droplets, which is then expelled into the air. They are very quiet and also come without filters. Ultrasonic humidifiers are costly than other humidifiers.

All the different types of humidifiers mentioned above work best to create a comfortable environment for the plants. They are easy to clean and also easy to maintain.

Maintenance of Plant Humidifiers:

Purchasing the best humidifier for plants is not enough if you want them to operate well or want to use them for a long time. While using humidifiers, you need to take some precautions and also should take proper care of them.

The first is the cleanliness. The water tanks of the greenhouse humidifier should be cleaned once or twice a week to prevent calcium or bacterial build-up, due to the accumulation of excess dirt or minerals. The tanks should be cleaned with bleach to get rid of the excess dirt and then should be rinsed properly.

Besides cleaning the tank, you should also replace your filter on time when it gets filled with minerals or debris. Using distilled and clean water in the humidifier is encouraged, as rainwater and hard water contains a lot of minerals and therefore spoils the filter fast.

They also produce a white dust, which gets accumulated on the bottom of the tank. If you want your plants to breathe fresh, clean, and germ-free air, then you need to replace your filter on time and should keep the water tank clean.

Make sure to check the humidity level of the room regularly and try to keep it moderate, so that it doesn’t become too extreme or too low for the plants.

FAQ’s: Some common ques.about best humidifier for plants:

1.What Is Humidity?

The simple definition of humidity is the amount of water vapor present in the air or atmosphere. There are also other terms of humidity that you might hear of, relative and absolute humidity.
The ratio between the genuine water vapor present in the air relative to the amount of water vapor that the air can hold at a specified temperature is called relative humidity. On the other hand, absolute humidity is the actual water vapor present in the air and is expressed in grams or kilograms per cubic meter.
In high-temperature, the air holds more water vapor, and at low-temperature, the amount of moisture in the air is less. Various types of plants thrive in different levels of humidity.
So depending upon the air temperature, you need to set the humidity level of your grow room. The ideal humidity level for plants is 40%-50%.

2.When Should I Use a Humidifier for My Plants?

The right amount of humidity is good for plants. When the humidifier provides moisture in the air, plants certainly get some significant advantages. But it is important to know when you should use a humidifier for your plants.
Such as, misting your indoor plants at night is not an ideal practice. It may cause various diseases to the plants. Make sure to mist the plants before noon, in the morning is the best. It allows the plants to utilize the humidity during the daytime.
Because of the lack of sunlight, water won’t perfectly evaporate at night. It causes too much moisture around the plants. The soil and plant’s surface can retain extra humidity. When there is extra humidity in the atmosphere, plants can be easily affected by different diseases.
So, morning is the perfect time when you can use a humidifier to adjust the humidity level for your plants.

3.where to place humidifier for plants?

The humidifier should not be put nearby or too distant from the plants. If you place it very near to the plants, then the leaves of the plants may start to get affected by fungus or mold build-up due to excess moisture.
And if you put the humidifier far from the plants, then they won’t get enough moisture to thrive, and the plants will become stale and dry. So, keep 5 or 6 meters distance between the plants and the humidifier and make sure to place the humidifier in such a way so that all the plants get enough moisture to absorb.

4.What size of humidifier I should use for my grow room?

The size of the best humidifier for indoor plants will depend on the size of the room. Measure the size of the grow room and buy a humidifier according to it. Large-sized humidifiers are appropriate for large rooms that are 500 sq. ft or larger. Small-sized humidifiers should be used for 300 sq. ft rooms or smaller than that.

5.Which one is better, cool mist or warm mist?

Both are better and pretty much works the same for the plants. Warm mist humidifiers evaporates the water to purify it while cool-mist humidifier contains a filter that catches all the debris and dirt from the water, and filters them to emit clean and germ-free cool mist. But, cool mist humidifiers operate for a more extended period and consume less energy too.

6.Should I change the filters often?

Many manufacturers recommend replacing the purifying filter every three or four months. But, if you use hard water, then the filter may not last that long. So you need to use distilled water as it helps in using the filter for a long time. Besides this, if you find any defects in the filter then you should change it immediately.

7.What is the appropriate level of humidity for plants to thrive?

Different types of plants grow at different humidity levels. But the suitable humidity for the plants is around 40%-60%. You need to gather information regarding the plants and their appropriate humidity level beforehand for their healthy growth.

Final Verdict

Plants grow in a healthy and comfortable environment, and the humidifier for plants helps them by releasing the required moisture in the air for their nourishment.

So, what is the best humidifier for plants? or which humidifier is best?any straightforward answer? If you want an excellent humidifier for your large grow room, then I recommend  Honeywell’s cool mist HCM-710, as it runs for 36 hours at one filling and contains one-gallon large water tank. It is easy to clean and also disperses pure and fresh moisture into the air.

And if you want something small, then Pure Enrichment’s MistAire ultrasonic cool mist humidifier will be the right choice. It disperses cool mist with the help of its ultrasonic technology and also contains an aroma dispenser.

However, choose the right humidifier for plants according to their needs and your personal preferences. But always be careful to give the best to your indoor plants.

Suggested Reading:

* Top 8 Humidifiers for Asthma and Allergies
* Crane Ultrasonic Cool Mist Humidifier Review

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