Buyers Guide & Information

Best Humidifiers for Plants

We compare the top-rated brands for healthy air when growing indoors.

There are many benefits to growing your own indoor garden, like the fact that house plants can improve the overall quality of the air you breathe every day. It doesn’t matter what you’re growing; plants can only thrive in a certain climate and with specific environmental conditions.

Humidity is one of the most overlooked factors when it comes to keeping your plants healthy. It doesn’t matter how often you water your plants, they still need to draw moisture from the air around them, and the best humidifier for indoor plants can help with that.

Benefits of Using a Humidifier for Your Indoor Plants

Although all plant species are slightly different in their humidity preferences, the general rule of thumb is to keep an indoor garden between a humidity level of 50 and 60%. When the air is this humid, the plants aren’t able to draw in moisture from the air, and the root system isn’t always able to pick up the slack by drawing water from the soil.

If you’ve noticed your house plants start to wilt, discolor, or curl at the leaf tips, there’s a very good chance that dry air is the culprit. Investing a good humidifier for plants can fix these problems and restore your plants to a healthy state.

A huge perk of keeping the environment humid is that you won’t need to water your plants as much, and this can save a lot of time in the long run. Another benefit is that keeping your house at a humidity of 50% is actually ideal for humans as well as plants, especially if you normally suffer from dry skin, asthma, or allergies.

Humidifiers for Plants Compared

Model Room Size Tank Capacity Runtime Price
TaoTronics 322 sq. ft. 1 gallon 30 hrs Check Amazon
Pure Enrichment MistAire 250 sq. ft. 0.4 gallons 16 hrs Check Amazon
AIRCARE 831000 2700 sq. ft. 6 gallons 70 hrs Check Sylvane

Check Amazon

LEVOIT LV600HH 753 sq. ft. 1.5 gallons 36 hrs Check Amazon
Honeywell HCM350B 360 sq. ft. 1 gallon 24 hrs Check Amazon
Vicks Filter-Free 250 sq. ft. 1.2 gallons 33 hrs Check Amazon
Pure Guardian H965AR 320 sq. ft. 1 gallon 70 hrs Check Amazon

Buying Guide: Choosing Quality Humidifiers for Plants

Humidifier Type

The two main types of humidifiers for an indoor garden are ultrasonic and evaporative (we’ll talk about the other types later on).

The Spruce says that an ultrasonic humidifier for plants “is one that uses high-frequency sound vibrations to produce an extra fine water mist that is then expelled to add moisture to the room. It is often considered the quieter of both types of humidifiers.”

An evaporative humidifier, on the other hand, is more basic but just as effective. Ultrasonic machines are pricier, quieter, and sleeker in design, which is why they’re great for the bedroom or common spaces at home. But your plants aren’t too picky about noise or aesthetics, so most indoor gardeners go with the evaporative style to save a few bucks.

Grow Room Size

Every humidifier has a designated coverage area that’s measured in square footage. Pay close attention to this number – you won’t get very far if your garden is 500 square feet and you choose a humidifier for a 250 square-foot space.

Water Tank Capacity

Generally speaking, the larger the water tank capacity, the greater the coverage area, and the longer the run time. But try not to assume that a larger tank is always better; remember that it’s up to you to refill this tank, and lugging around gallons of water might not be ideal. A tank size of 4 to 6 liters (1 to 1.5 gallons) should be plenty big for your indoor garden.


Most humidifiers come with a wide runtime range – take the TaoTronics machine as an example. The manufacturer has listed that this humidifier can run for anywhere between 12 and 30 hours. That’s because it depends on how dry your air is to start compared to the humidity setting you choose.

Ease of Setup, Use & Maintenance

Most humidifiers are ready to use right out of the box (all you have to do is plug it in and fill up the water tank). That said, it’s still a good idea to check if there are any additional installation steps or any complicated instructions for using the machine.

It’s worth noting that humidifier maintenance can be a pain – but it doesn’t have to be. Many humidifiers come with filters to clean out minerals in the water before converting it into moisture, so always confirm the filter lifespan before buying. Some filters can last for as long as 1 year, but others should be replaced every season.

Extra Features

The best feature for an indoor garden humidifier is a built-in humidistat that sets the exact humidity level that’s ideal for your plants. Some models only come with settings like Low, Medium, or High, but your plants will benefit more from a machine that lets you set an exact value, like 52%.

Other features to look for to please your green thumb are a programmable timer, overflow protection, automatic shut-off, mist output controls, easy-to-use humidistat, and noise level settings (Sleep Mode).

Price & Warranty

Humidifier prices are all across the board. The cost has to do with many factors, like humidifier type (ultrasonics tend to be more expensive than evaporative machines), coverage area, and added features. The good news is that there is a humidifier for all indoor gardening budgets, so just establish the amount you’re willing to spend before you start shopping around.

7 Best Plant Humidifiers Reviewed

1. TaoTronics

Our Top Pick
Type Cool Mist Ultrasonic
Water Tank Capacity 4 liters (1 gallon)
Room Coverage 107 – 322 sq. ft.
Daily Humidity Output Up to 2 gallons/day
Runtime 12 – 30 hrs
Filter Life 4 – 6 months

TaoTronics has been rated as the best humidifier for house plants for a few reasons. The main one is that it’s possible to set the exact humidity percentage that your plants are craving rather than just set a general Low, Medium, or High setting. In addition to setting an exact humidity preference, this humidifier comes with 3 different mist settings.

This humidifier uses ultrasonic technology that’s ultraquiet; it’s essentially silent, producing less than 38 decibels of noise. The 4-liter, 1-gallon tank capacity is perfect for a small to medium-sized grow room and can run anywhere from 12 to 30 hours depending on your preferred humidity settings and the current level of moisture in the room.

There’s an auto shut-off feature when the water runs out. It’s built with a microporous cartridge that filters the water and removes microorganisms that could cause potential harm to your indoor garden. This humidifier is not only great for plants but also for alleviating sinus issues, allergies, and asthma. If you’ve got plants in the bedroom, this is the obvious choice; the nighttime Sleep Mode is extra discreet.

All in all, the TaoTronics is effective, easy to use, and fits the bill. The compact, portable design is surprisingly powerful, but the best part of all is the built-in humidistat that gives you complete control of grow room humidity levels. One thing to keep in mind is that you will need to change out the filters every 6 months or so, which will add slightly to your humidifying costs.


  • Affordable
  • Great for plants and humans
  • Allows for exact humidity settings
  • Sleek, compact design
  • Easy-to-use controls


  • Frequent filter changes
  • Short 1-year warranty

2. Pure Enrichment MistAire

Best Small Humidifier for Plants
Type Cool Mist Ultrasonic
Water Tank Capacity 1.5 liters (0.4 gallons)
Room Coverage 250 sq. ft.
Daily Humidity Output Up to 1 gallon/day
Runtime 16 hrs
Filter Life No Filter

The MistAire by Pure Enrichment is an excellent choice for a small grow space. This small humidifier for plants has a low tank capacity of 1.5 liters (0.4 gallons), but you can still get a decent runtime of 16 hours out of it. The machine itself weighs less than 2 pounds before the water is added, and the design is compact enough to fit on a small table in the middle of your grow room.

What’s impressive, though, is the humidifying power that you get from such a small machine. Even with a 1.5L tank, you’ll deliver moisture to a room up to 250 square feet. The 360-degree mist nozzle allows you to easily direct the flow of mist away from areas that don’t need moisture and toward the areas that do, keeping your plants happy and healthy.

One especially nice feature of the MistAire is that it’s built without a traditional filter and filters the water through more advanced ultrasonic technology instead. That means you won’t have to worry about regular filter changes, but you will still have to perform regular cleanings.

The humidity output 150 ml per hour (about 1 gallon per day) is relatively low, but as long as you don’t exceed the recommended coverage area, this shouldn’t be a problem. However, if your home is suffering from exceptionally dry air, you may need to look for a machine with a higher output, like the TaoTronics, which gives off 2 gallons per day.


  • No filter replacements
  • 360-degree mist control
  • Easy to assemble
  • Easy to move around the house
  • 5-year warranty


  • Not ideal for extremely dry homes
  • No filter, so cleaning is critical

3. AIRCARE 831000 Space-Saver

Best for Large Grow Rooms
Type Whole House Evaporative
Water Tank Capacity 6 gallons
Room Coverage 2700 sq. ft. (option for 2300)
Daily Humidity Output Up to 8.5 gallons/day
Runtime 70 hrs
Filter Life Replace Seasonally

So far, we’ve covered two reliable options for small to medium-sized grow rooms, but what about plant lovers who have plants scattered across the entire home or with large grow rooms? One option is to buy separate humidifiers for each part of the house or place a few units throughout the grow room. But the better choice is to invest in an Airecare Space Saver. whole house humidifier

This large humidifier comes in two different models – one for 2300 square feet and one for 2700 square feet. No matter which one you go with, it’s evident that this humidifier is more suited for large grow rooms and even entire homes (as long as your home follows an open concept design).

The product description of the Airecare Space Saver on Sylvane says that “with a 6-gallon capacity, this humidifier can be run up to 70 hours continuously without refilling. It’s perfect for whole-house humidification, multiple rooms, large apartments, or medium-sized homes.”

Best of all, the price is right, and buying one Airecare is much more affordable than purchasing several smaller humidifiers.

One drawback that comes along with a large, 6-gallon water tank is that filling it up can be a pain. It’s a direct-pour style tank, which means that you’ll just pour water directly into it when it’s time for a refill. This can be a tedious process, but the good news is that you only have to do it every few days with the machine running nonstop.


  • 2-year warranty coverage
  • Great for both pets and plants
  • Auto humidistat/digital controls
  • Check filter indicator


  • Water refills can be a hassle
  • Needs seasonal filter changes


Best for Warm & Cool Misting
Type Warm/Cool Mist Ultrasonic
Water Tank Capacity 6 liters (1.5 gallons)
Room Coverage 753 sq. ft.
Daily Humidity Output Up to 3.2 gallons/day
Runtime 36 hrs
Filter Life No Filter

Most humidifiers for plants only come with cool misting capabilities, but if your grow room tends to run cold, a warm misting humidifier is the better choice. But what’s even better than that is choosing a machine with both warm and cool misting, like the Levoit LV600HH, especially since plants can benefit from both of these features.

This 6-liter, 1.5-gallon humidifier is best for medium and large rooms up to 750 square feet.

According to the Levoit company, “the warm mist helps kill bacteria in the water and humidifies the room more quickly, while the cool mist keeps your sinuses and skin hydrated during the summer.”

It’s clear that both you and your plants can benefit from the warm/cool misting of the LV600HH.

Similar to the TaoTronics #1 choice, this one is built with a humidistat that allows a user to set an exact humidity percentage. This gives a grower complete control over room humidity, and it’s especially handy if your home tends to have fluctuations in air moisture levels. There have been some complaints about the accuracy of the hygrometer, but if you’re smart about humidifier placement, it’s as accurate as any other plant humidifier on the market.

Another added perk is that you can use essential oils with this machine, but it’s not suggested that you do when it’s being used in the grow room. But still, this a pretty cool feature if you’d like to perform some aromatherapy for yourself. Another thing growers love about this machine is that it can be controlled with a convenient remote control, so you can select your ideal settings from across the room.


  • No filter maintenance required
  • Aromatherapy essential oil diffuser
  • Warm + cool misting
  • Remote control functionality
  • Easy to clean design


  • Complaints on accuracy of hygrometer

5. Honeywell HCM350B Germ-Free

Popular Cool Mist Humidifier for Plants
Type Cool Mist Evaporative
Water Tank Capacity 1 gallon
Room Coverage 360 sq. ft.
Daily Humidity Output Up to 1.5 gallons/day
Runtime 24 hrs
Filter Life Replace Seasonally

It’s no surprise that a Honeywell humidifier made this list considering the respect Honeywell has rightfully earned from homeowners and plant lovers over the years. Honeywell is a company that delivers on its products, and if you have any problems, the customer service team usually straightens it all out fairly quickly.

These aren’t the only reasons why the HCM350B Germ-Free humidifier by Honeywell is such a popular choice. The real reason behind its popularity is the UV technology that kills 99.9% of bacteria in the water before it dispenses it into the room as moisture. Some growers might not see this as a necessary addition to their humidifier, but if you care about your plants and want them to draw in the cleanest air possible, this is a great feature.

Since this is an evaporative machine, it does require filter changes. The filter replacements aren’t expensive, and you’ve got the option to purchase the humidifier with several filters included. Another positive is that the 1-gallon water tank is detachable and easy to fill, so just fill it at the sink before securing it back into place.

One thing that some growers don’t love is that you can’t set the exact humidity percentage. The control panel is simple and easy to use, but it only lets you set your humidity preferences based on low, medium, or high mist outputs. If you’re working with finicky plants that are extra picky about their moisture preferences, this might not be the best choice.


  • 3-year warranty coverage
  • Germ-free mist output
  • Trusted brand
  • East to fill/clean


  • No exact humidity settings
  • Frequent filter changes

6. Vicks Filter-Free Ultrasonic

Best Small Filterless Model
Type Cool Mist Ultrasonic
Water Tank Capacity 1.2 gallons
Room Coverage 250 sq. ft.
Daily Humidity Output Up to 2.4 gallons/day
Runtime 33 hrs
Filter Life No Filter

Vicks is usually viewed as a brand that manufactures products to relieve breathing issues caused by allergies, illness, asthma, sinus issues, etc. But just as the Vicks Filter-Free Ultrasonic humidifier can help you breathe, the same goes for your plants. This cool misting machine is great for small to medium-sized grow rooms with a continuous runtime of 33 hours.

The best part of this humidifier is the filterless design, so you’ll never have to spend more money on replacement filters or spend your precious time changing them. But since there are no filters, it’s especially important that you use only pure water and frequently clean out the water tank.

If you choose to fill up the tank with tap water, one thing to keep in mind is that you might need to buy a separate demineralization cartridge for this machine.

Vicks says that “if you live in an area with a high mineral content in your water and are not using distilled or purified water, then you may notice atomized minerals (white dust) on surfaces around the humidifier. If this is the case then you should use a demineralization cartridge. The cartridge for this unit is model number HDC-200.”

The only real drawback aside from the fact that this machine isn’t powerful enough for large grow rooms is the fact that it often goes out of stock. This should show you how popular the Filter-Free humidifier is, and don’t worry; sellers tend to get it back in stock within a week.


  • Great value for the cost
  • Trusted Vicks name
  • No filters necessary
  • Highly effective moisturization


  • Goes out of stock often
  • Heavy humidifier design

7. Pure Guardian H965AR

Best Cheap Humidifier for Plants
Type Cool Mist Ultrasonic
Water Tank Capacity 1 gallon
Room Coverage 320 sq. ft.
Daily Humidity Output Up to 2 gallons/day
Runtime 70 hrs
Filter Life No Filter

Pure Guardian offers a humidifier that’s remarkably similar to the Vicks model just covered, but the value for money is slightly better, making it the best cheap humidifier for plants. Considering the low price, it’s hard to believe this humidifier has a tank capacity of 1 gallon and a continuous runtime of 70 hours.

To make things even better, the H965AR uses advanced ultrasonic technology that requires no filter. That means no filter replacements or maintenance, just make sure to keep it clean (which is easiest if you use distilled water for your refills). To help fight against germs and bacteria, it features Silver Clean Protection that fights the growth of slimy mold and mildew on the surface of the water tank.

Even though it can deliver moisture to 320 square feet, this humidifier is compact enough to sit on a tabletop. It’s built with a low water indicator light to let you know when it’s time to refill the tank. There’s also a multi-directional mister, which is great for making sure that all of your plants benefit from the added moisture, as well as an automatic shut-off function when the tank is empty.

The only complaint is that the 70-hour runtime is a bit of an overstatement. Sure, on the low setting, you may be able to get 70 hours of continuous operation, but on high, that’s very unlikely. Even so, the 40 or 50-hour runtime that you get instead is still very impressive compared to other plant humidifiers.


  • Essential oil tray included
  • Small yet mighty
  • Filter free design
  • Mold-resistant tank


  • False advertising for 70-hr runtime

4 Types of Humidifiers for Your Indoor Garden

We’ve covered the basics of ultrasonic vs. evaporative technology in the buying guide, but it’s important to fully understand what type of humidifier is best for plants. Only then will you be able to decide on the right humidifier for your garden. There are 4 types to choose from:

  1. Warm Mist
  2. Cool Mist
  3. Ultrasonic
  4. Evaporative

The main benefit of an ultrasonic model is that it’s usually built with a filter-free design.

After deciding on ultrasonic vs. evaporative, you can then decide on a cool or warm mist humidifier for plants. Some models come with both warm and cool misting functionality, but most just have one or the other.

Warm Vs Cold Mist: Which is Better For Plant Life?

The answer depends on the specific climate conditions of your house or grow room. If it’s getting too warm in your grow area, a cool-mist humidifier is the best choice. If you’re having trouble keeping the plant area warm, you’d want to go with a warm mister instead.

Proper Humidity Levels for House Plants

The majority of homes have a humidity level of about 30% (and even lower in the winter), which is much too low for house plants to thrive. Proper humidity levels vary across plant species, but you should aim for at least 50%. Aside from using a humidifier, other ways to increase humidity include:

  • Misting your plants with a spray bottle
  • Grouping your plants together (this creates a more humid microclimate)
  • Placing the plants in trays with pebbles and water
  • Using a terrarium (this is best for small plants)

People Also Ask (FAQ)

Are humidifiers good for plants?

If you’re still asking yourself, should I get a humidifier for my plants?, the simple answer is Yes. However, this might not be the case if your home (or a particular area of your home) is already very humid. It’s a good idea to check the humidity levels first, which can be done with a hygrometer.

How often should I mist my plants?

The LA Times says that every garden’s plant misting needs are different.

“Some plants want daily misting; others are OK with two to three times a week,” says LA Times.

“It’s also a good idea to rinse plants outside with a hose or in the bathtub at least twice a year. Not only does this provide them with moisture, but it also cleans the plant leaves and will prevent spider mite infestations.”

Are there any plants that are good for re-humidifying the air?

Plants don’t only crave humidity; they also create it. Selecting the best plants for humidifying can actually benefit you in a lot of ways. A humidifying indoor garden can help with dry air issues, like allergies, asthma, and dry skin. Certain plants are better at giving off moisture than others, like:

  • Boston Fern
  • Spider Plant
  • Peace Lily
  • Chinese Evergreen
  • Areca Palm

What are other ways to better manage humidity levels for my indoor plants?

The easiest way to add moisture to the growing area is to mist your plants at least a few times per week (but every day for some plant species). Another effective tactic is to group your plants together since they release moisture through their leaves. By doing this, you’ll be able to create a more humid microclimate in the growing area.

Is it possible to make a DIY humidifier for my plants?

If you’re into DIY tasks, you might be wondering how to make a humidifier for plants instead of buying one. Although it is possible to make a cheap and effective humidifier on your own, it’s much easier just to buy one that’s ready to use out of the box.

Where is a good place to buy a humidifier for plants?

Amazon carries everything these days, including humidifiers. The prices here are trustworthy, plus there’s a 30-day return period for most products if you aren’t satisfied.


Still wondering what is the best humidifier for your plants? The TaoTronics is a great choice, especially considering its highly-accurate built-in hygrometer and easy-to-set humidistat. This machine isn’t for every plant-lover, though, especially if you’re dealing with an ample growing space. If that’s the case, you’ll want to go with the Aircare or the Levoit depending on the square footage.

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