A Definitive Guide for 2021: The Best Humidifier for Plants

Humidity is an essential factor in the growth of indoor plants. Many plants originate from humid jungle environments. So providing them with enough moisture is vital to keep plants green and healthy.

Also, a humidifier can help your body due to its medicinal properties. Especially if you suffer from dry skin or sinuses and sour throat.

Yet, choosing the Best humidifier for plants can be a difficult task.

While humidity is necessary to keep gardens healthy, excess of it can lead to mold growth. Also, not all plants need the same moisture level. You must ensure not to increase humidity altogether.

The thing is, there are many devices on the market, but which one will be best for your houseplants?

This article will cover the most common methods to create humidity. What you need to know for choosing the best humidifier, and a review of the top 5 products, in our opinion.

Why is humidity important for plants only for some plants?

Humidity is good to keep plants from drying out. It's a must for orchids and other exotic plants that are being grown indoors as houseplants.

But, high humidity can be an enemy if you want to grow vegetables like tomatoes or carrots.

The humidity level in rainforests can reach 100% all year-round. So the plants that grow there don't create a robust root structure due to high water availability. They do not need to draw water from the soil like other plants.

But once you get a plant from this environment and bring it into your home, you need to mimic the same humidity.

Keep in mind the ideal percentage of humidity indoors is around 35-50% in the summer and 15-25% in the winter.

Houseplants and Their Ideal Humidity Levels:

  • leafy greens - 50-70%;
  • tropical plants - 40-60%
  • herbs - 40-70%
  • orchids 40-70%;
  • cacti - 10-20%
  • ferns - 40-50%

By plants stages:

  • Germination stage - 90-100%
  • vegetative stage - 50-60%
  • the flowering stage of mature houseplants - 40-50%

Do I need a humidifier for my plants?

The easiest way to test this is to look at them with a magnifying glass. Then examine their leaves for signs of dryness or wilted spots.

To decide if you need a humidifier for your plants, consider the following:

  • What type of plant are you growing?
  • How big is your indoor garden?
  • Do you live in an arid environment or near water sources such as lakes and oceans?

Each of these questions will help determine how much humidity your plants need and which one to buy.

What Type of Plant Are You Growing?

This is the most essential factor in determining whether you need a humidifier. Plants with thick, tough leaves such as succulents do well without extra humidity. In contrast, plants with thin and fragile leaves are more sensitive to dry air.

Where do you live?

In many geographical areas, living without plant humidifiers can worsen plants' growth rates. 

When you live in a drought climate, plants will need some supplemental moisture to thrive.

If you live in a tropical one with lots of rain, you will need to humidify less often but still be vigilant.

How big is your indoor garden?

The size of your garden is the most critical factor when deciding which humidifier type to buy. Large areas are best served by cool or warm mist humidifiers. In contrast, small rooms benefit more from tabletop and ultrasonic models.

What kind of humidifier is best for plants?

There are four types of humidifiers for plants. Those are warm mist, cool mist humidifier, ultrasonic, and evaporators. Each has its own pros and cons, so choose the one that fits your lifestyle best!

  • Cool Mist Humidifier 

This is the most common humidifier for plants.

They offer the best combination of efficiency and rate-of-humidity output. Releasing water vapor can raise the humidity by 30%, running at its full capacity.

Cool-mist humidifiers use a filter system. This makes them more energy-friendly than the evaporation method of warm-mist humidifiers.

  • Warm Mist Humidifiers

Warm mist humidifiers use heated steam from boiling water to increase the humidity. They're ideal for gardens needing high humidity levels, such as greenhouses or conservatories.

Warm mist is the best one for dry climates or when you want an extra boost of warmth during cold weather months. It's important not to overuse your unit by running 24 hours per day. This will increase energy costs without adding any extra benefit!

  • Ultrasonic Humidifier

Ultrasonic Humidifiers use a high-frequency sound to create water vapor. They are the most expensive and the best plants humidifiers. You can use them in any room without condensation on walls or windows and don't make a noise like other types. For example, these are the best humidifier for growing mushrooms.

  • Evaporative Humidifier

An evaporative cooler is passing airflow using a fan through a wet wick filter or pad to create water vapor. It is best for a small grow room.

Still, they make more noise than other humidifier models because they use a fan pushing air. Yet, they tend to use less energy than other types.

Is a warm or cool mist humidifier better for plants?

You might be wondering whether it matters if your humidifier puts out a warm mist or cold mist. The answer is no.

Most plants will do fine with a warm mist humidifier.

Still, keep in mind that you should also have a thermostat set at about 70 degrees Fahrenheit. If not, they might begin to wilt from the heat created by their pot and soil combined with a hot humidifier.

9 Essential Features for the best plant humidifiers

A humidifier is a device designed to provide comfort to humans and not plants. A humidifier can do wonders for us humans. Still, some features don't work as well as others when it comes to our interior gardens.

Here's what you should look for:

1. room size

Your room size will affect the size of the humidifier you'll need. You should measure the square foot or meter of your indoor garden. For example, a small room will need a smaller plant-focused unit than a large open room.

2. humidity levels

All plants like different humidity levels depending on their type. Some prefer bathing in the humid air. In contrast, others do well with lower moisture in the air.

So, it's best to get a humidifier that lets you adjust humidity levels to meet their needs.

3. humidistat

A humidistat is a feature that allows you to set how much humidity should be in the air at all times. Then it will release as much moisture as needed for this level.

Humidistats are a smart option for those who want to maintain a specific humidity level. This is crucial when growing plants indoors in colder months and where the air is drier than usual. 

4. leak proof 

When it comes to water tank size, bigger is better. You'll have more water stored inside that can release into the air at once, which will help your plants grow. Yet, you want to ensure the tank is leakproof. It will ensure water doesn't escape from the tank and into your room.

5. rotating mist nozzle

Some units have rotating mist nozzles, while others release in straight lines. This feature determines how much moisture gets removed from each blast of air.

Units with more than one nozzle or head over these heads allow for greater coverage. Still, those who prefer smaller, more compact humidifiers might find this too bulky.

5. Run time

Your humidifier run time will depend on the size of your water tank and how often you would like to refill it.

6. Filter Cartridge

A filter cartridge is not required with every humidifier. But, it is necessary for those using an evaporative humidifier. You need to replace the cartridge every few months, and the cost varies depending on the size of your unit.

7. humidity Display

This is a newer addition to the humidifier market. It is beneficial to ensure your humidifier run time and output are functioning well.

8. Ozone

Some units produce ozone as a byproduct (usually those with an evaporation system). If this concerns you, it would be wise to research the chosen model properties before buying.

9. Noise level

Finally, many people find noise levels critical when picking out a new humidifier. So how loud should they run?

If noise bothers you, ensure your chosen humidifier has a built-in quiet operation.

5 Best Humidifiers for Plants Reviews

Here are our recommendations for the top 5 best plant humidifiers. All have proved to be the best quality. They also have attractive design units to fit your stylish home.

The five humidifiers are the:

  1. HuPro Cool Mist Ultrasonic Humidifier
  2. GENIANI Top Fill Cool Mist Humidifiers
  3. LEVOIT Cool Mist Air Ultrasonic Humidifier
  4. TaoTronics Warm and Cool Mist Ultrasonic Humidifier
  5. Homasy ColorMist Cool Mist Humidifier

1. HuPro Warm & Cool Mist Ultrasonic Humidifier (Price $120)

HuPro Warm & Cool Mist Ultrasonic Humidifier

Hupro humidifier is an excellent choice for maintaining a healthy environment. Especially if you don't have extra spare time.

This humidifier uses ultrasonic waves without filters since there's no harmful ultraviolet light. With a water tank capacity of 6L, it is excellent for big rooms and a large area of up to 500 sq. ft.

The HuPro regulates humidity with a cool/warm mist humidifier between 30% and 85%. Also, it comes equipped with three levels of humidification: high, medium, low settings.

This model has an auto-shutoff functionality. It will turn off the device when the water level falls too low when running at high speed. So you can ensure your plants get as much moisture as they need!

It features a LED screen display with a touch panel. This gives you better airflow quality control. It also comes with remote control.

Last, it includes a built-in essential oil diffuser. It will spread irresistible scents to put you into the right mood.

The Hupro humidifier is an excellent choice for those who don't want to worry about humidity. It scans the surrounding environment and regulate the mist output for optimal moisture.

2. GENIANI Top Fill Cool Mist Humidifier (Price $40)

GENIANI Top Fill Cool Mist Humidifier

This is a very popular humidifier for indoor plants. It's made by one of the top manufacturers in the industry. It has an easy-to-fill design and can give up to 18 hours of moisture before needing a refill!

It also gives you three mist settings to adjust how much water vapor is released into your room. Silent mode recycles only enough power when needed. Medium mode emits less noise but uses more energy. And High Mode (you guessed it) for those who want their garden leaves nice and green all year round!

It included a 2-year warranty and has a coverage of up to 220 sq. ft.

The GENIANI Top Fill Cool Mist Humidifiers is the best plant humidifier for people on a budget. It will nourish their houseplants with a high-quality device.

3. LEVOIT Cool Air Ultrasonic Humidifier (Price $70)

Levoit humidifiers for bedroom home large room

The LEVOIT Ultrasonic cool mist technology is an excellent option as a first humidifier. It's easy-to-fill design and can give up to 60 hours of moisture before needing a refill!

It has auto-shutoff mist settings and will turn the device off if it runs out of water or when its water tank becomes too hot. This means you'll save money on your electric bill in the long run.

It covers rooms up to 505 ft² and lasts for 60 straight hours. It also includes super whisper Quiet operation: produce less than 30 dB of noise.

Last, it regulates the humidity levels with no extra effort from you. All you have to do is set it and forget it! It works with Alexa and Google Home, so you can turn it on and off using your voice command.

The LEVOIT humidifier is an excellent option for those looking to buy their first one. It's easy to use, provides plenty of moisture, and is small enough for any room!

4. TaoTronics Warm and Cool Mist Ultrasonic Humidifier (Price $90)

TaoTronics Top Fill Humidifiers for Large Rooms

The TaoTronics Cool Mist Humidifier is great as it can perform well in hot and cold environments. It's a small humidifier, lightweight, and easy to use on top of its affordable price!

It maintains a constant indoor humidity level (55%-65%) without any effort. Not only that, but it turns on and off as needed and also includes a sleep mode with no night light as the LED screen will not be active.

The TaoTronics Cool Mist Humidifier design widens its scope to cover rooms up to 753ft² / 70m². Also, it features a water tank capacity of 6L/1.58Gal capable of producing 60 hours of continuous cool mist. You don't have to worry about refilling it.

5. Homasy Cool Mist Humidifier (Price $30)

Homasy ColorMist Cool Mist Humidifier

The Homasy Cool Mist Humidifier is a perfect choice. It's affordable and includes many features that make the user's life easier.

There are 3 types of humidifiers: high mist, low humidity mist, and sleep mode. You can forget about waiting for "mist time" to fill up because it lasts 30 hours. The water tank capacity can hold 2.5L of water, enough for an area of up to 300 sq.ft²

Homasy Cool Mist operates at a quiet operation of 25 dB, allowing you to sleep well without any added noise. Noise control technology ensures you will only hear your own heartbeats and breathing. Rest easy tonight!

This product is also straightforward to clean. The design is simple, and you can detach the water tank from the base for easier cleaning.

Homasy ColorMist Cold Mist Humidifier is one of the top humidifiers on Amazon. It has over 400 reviews (now) and averaging almost five stars out of five stars possible. It is a perfect choice if you need an affordable, high-quality product that will last.

How to best use your humidifier?

To get the most out of your humidifier, you must use it the correct way.

What is the Best time to use humidifiers for plants?

Morning and evening are the best times to use humidifiers for your plants. Overnight is a great time as well. Interior humidity levels can drop during this period. Still, it's important not to go too long without adding moisture. Since then, you'll need to check on them more often, or they will dry out quicker.

Should you run a humidifier all day or at night as well?

Most experts agree that running a humidifier all day is not necessary. Moisture can be built upon your furniture and floors, which can lead to mold, bacteria, or other problems.

A good rule of thumb is to turn it on for one hour in the morning and evening when you're home. Let it off while away from home.

How often should I change my water?

This depends on how much you use it. If you need more moisture, consider doing so every two days or even once per day if required. If your plants need less humidity, then weekly changes may suffice.

Where should I put the humidifier?

Place the humidifier near the plants but not too close to damage them with moisture. The best place is on a table or surface that projects some air under the pot. So there is good circulation for aromatherapy and humidity. This will keep your home smelling nice while also keeping your plants happy!

Maintaining your humidifier

Keeping your humidifier clean is a key to keeping it running well. If it's not too complicated to dismantle for washing, you should empty it often and wipe it with warm, soapy water. You can also boil the wick once per month to get rid of bacteria that may have built upon it!

Is there anything I shouldn't do while using my humidifier?

Never use any oil or chemicals on the surface of the humidifier wicks. This will damage them over time and make them less effective. The same rule applies when you change filters. Avoid oils whenever possible. They are hard enough for humans without adding these extra challenges!

How to raise My plant's humidity without a humidifier?

So, can you humidify your room without a humidifier?

Yes! You can try a few different things to raise the humidity in your plants without using a humidifier.

  1. One option is to use clay pebbles or stones from rivers outside in your planter. This will release water vapor that builds up over time into the dry air inside. This process takes about two weeks, so it's not as fast as an electric humidifier. Still, if you're patient, then this technique can be very effective.
  2. There are also methods for creating DIY projects out of plastic bottles. Make holes through one side and taped shut on top. When filling these containers with boiling tap water, their insides heat up and turn into thick steam! This method is that it's not ideal for humidifying an entire room. The water evaporates quite fast, so you'll need to replace the hot tap water all the time.
  3. Another popular option is to place a pot inside a pot. Select a one or two sizes bigger pot than the pot of the houseplant. Fill the pot with water and place the houseplant in this larger pot. Keep in mind that the larger pot should be waterproof to prevent leakage. You can also place sphagnum moss in the gap or use biodegradable peat pots. As the water evaporates or the sphagnum moss dries out. Thus humidity level rises.
  4. The cheapest and easiest way to increase air humidity is to spray plants with a fine water mist. When misting plants, it's best to move them to a sink or tub. As moisture can damage wooden furniture and soft furnishings.

Can I use an oil diffuser as a humidifier?

No, oil diffusers are not meant to be humidifiers and do a great job at what they're intended for.

Essential oil humidifiers are not bad for plants. Still, these devices do not have the capabilities of raising indoor humidity levels. They're best used as an alternative source of scent instead of a supplement to other types of humidifiers.

Frequently Asked Questions

1. Do ultrasonic humidifiers emit ozone?

Ultrasonic humidifiers don't emit any form of harmful gases or chemicals. They use electrostatic atomization that produces large amounts of droplets without involving heat. In fact, this is one reason why people love using this particular type over others.

2. Do humidifiers cause mold?

No, humidifiers are not causing mold to grow in and around your home. Mold requires warmth, moisture, and food (cellulose) to increase. A humidifier does not offer all those three components, so it won't cause decay.

3. Do I need a filter with my humidifier?

Some ultrasonic and evaporative humidifiers use filters. You need to replace them once they've reached their lifespan limit. Which is anywhere from six months up to one year.

4. Is a vaporizer the same as a humidifier?

Humidifiers release cool water to create a fine mist into the air. Vaporizers first boil water and then release the steam. You should know that the American Academy of Pediatrics (AAP) recommends using a cool-mist humidifier.

5. Can you use tap water with a humidifier?

No, tap water quality may contain minerals that can clog the humidifier. It can cause it to break down. Your best bet is to use distilled or filtered water.


The Best plant Humidifier will keep plants looking great all year long.

In this article, you've learned that there is no one choice when it comes to humidifiers for plants. There are many types and features available. Your plants will thank you for taking care of them!

About the author 

Pamela G. Martin

Passionate about urban gardening, indoor growing solutions, and sustainability. Believes in growing our own food and eat fresh and better food by getting back to basics, growing a fruit and vegetable garden, and cooking from scratch.