# The Best Dehumidifiers for Plants (and Can You Use the Water on Them?)

> Most houseplants want more humidity, not less. Here's how to tell when a plant room really is too damp — and what to do with all that collected water.

Canonical: https://www.enthusiastreview.com/best/best-dehumidifier-for-plants/
Last updated: 2026-11-05
Published: 2026-09-28
Category: Specialty & Storage
Publisher: Enthusiast Review

Two questions bring most people here: does my plant room need a dehumidifier, and can I use **dehumidifier water for plants**? The short answers are "probably not" and "usually, with care." Most common houseplants are happiest at **40–60%** relative humidity, and tropical varieties often prefer **60–80%** — higher than many homes manage in winter with the heat running. For a typical collection, a humidifier helps more than a dehumidifier.

There is one situation where drier air is the right fix: a room crowded with plants, misted often or sitting on pebble trays, that stays humid enough to invite powdery mildew, gray mold, fungus gnats or root rot. That's the job the units below are chosen for — and we start with the tool that tells you whether you're in that situation at all.

## Our top picks

- **Start here: best diagnostic tool:** AcuRite 01080M — [check price on Amazon](https://www.amazon.com/dp/B000XTJRRA?tag=sktiger-20&linkCode=ll1)
- **Best for a shelf or propagation closet:** Eva-Dry E-333 — [check price on Amazon](https://www.amazon.com/dp/B000H0XFCS?tag=sktiger-20&linkCode=ll1)
- **Best for a plant room or sunroom:** Midea Cube 20 — [check price on Amazon](https://www.amazon.com/dp/B08ZMY8BC8?tag=sktiger-20&linkCode=ll1)
- **Best for large plant collections:** Pro Breeze 30-Pint — [check price on Amazon](https://www.amazon.com/s?k=Pro%20Breeze%2030-Pint%20Compressor%20Dehumidifier&tag=sktiger-20)

Before buying any dehumidifier, start with the **AcuRite 01080M Pro hygrometer** to confirm your plant room really runs too humid; if it does, the **Midea Cube 20** is our pick for a sunroom or plant room.

## 1. AcuRite 01080M Pro Accuracy Indoor Hygrometer — Start here: best diagnostic tool

[Check price on Amazon](https://www.amazon.com/dp/B000XTJRRA?tag=sktiger-20&linkCode=ll1)

**Pros**

- Tells you whether the room is too humid or too dry
- Small enough to sit among your plants
- Inexpensive insurance before buying a bigger appliance

**Cons**

- Measures only — doesn't change humidity
- Reads one spot, so placement matters

**Why we picked it:** Most plant-humidity mistakes come from guessing. A good hygrometer settles the question: many rooms that feel "too humid for plants" actually sit comfortably within the 40–60% range — or are too dry for tropical varieties, a problem a dehumidifier would make worse.

**Performance:** Place it near your densest cluster of plants rather than on a far wall, because grouped, actively transpiring foliage creates a more humid pocket than the room average. Check it at different times of day for a week before deciding. If it rarely climbs above 60–70%, skip the dehumidifier.

| Spec | Value |
| --- | --- |
| Type | Digital hygrometer and thermometer |
| Measures | Humidity and temperature |
| Power | Battery |
| Best for | Diagnosing any plant room |

## 2. Eva-Dry E-333 Renewable Mini Dehumidifier — Best for a shelf or propagation closet

[Check price on Amazon](https://www.amazon.com/dp/B000H0XFCS?tag=sktiger-20&linkCode=ll1)

**Pros**

- No cord needed while it works
- Color-change indicator shows when it's full
- Recharges and reuses — no ongoing cost
- Completely silent

**Cons**

- Only for small, enclosed spaces
- Needs regular overnight recharging

**Why we picked it:** An enclosed propagation shelf or a closet full of overwintering cuttings can get clammy fast. This silica canister quietly takes the edge off without adding heat, noise or a tank to empty.

**Performance:** Eva-Dry rates the E-333 for up to 333 cubic feet, which suits a shelf unit, cabinet or small closet rather than a room. When the beads change color, you plug it into a wall outlet overnight to dry it out. As with every pick here, confirm the space is actually too humid first — cuttings often want more moisture, not less.

| Spec | Value |
| --- | --- |
| Type | Silica gel, rechargeable |
| Rated space | Up to 333 cu ft |
| Power | Only while recharging |
| Best for | Plant shelf, propagation closet |

## 3. Midea Cube 20-Pint Smart Dehumidifier (MAD20S1QWT) — Best for a plant room or sunroom

[Check price on Amazon](https://www.amazon.com/dp/B08ZMY8BC8?tag=sktiger-20&linkCode=ll1)

**Pros**

- Humidistat lets you hold a plant-friendly target
- Quiet enough for rooms people use
- ENERGY STAR Most Efficient
- Wi-Fi app shows humidity remotely

**Cons**

- May not keep up with a very large collection
- Bucket needs emptying without a hose

**Why we picked it:** A plant room doesn't want bone-dry air — you're trimming an excess, not chasing the lowest number. The Cube 20's set-a-percentage humidistat lets you hold the room at, say, 60% and then stop, which is exactly what plants need.

**Performance:** It's rated at 20 pints a day under the DOE 2019 test and carries Consumer Reports' Excellent ratings for humidistat accuracy and noise, which matters in a sunroom you actually sit in. A south-facing glass room full of tropicals, misted daily, can easily trend past 60%; this unit is sized for that. If plants are only part of the moisture problem, see our [sunroom picks](https://www.enthusiastreview.com/best/best-dehumidifier-for-sunroom/).

| Spec | Value |
| --- | --- |
| Capacity | 20 pints/day (DOE 2019) |
| Humidistat | Digital, set % target |
| Efficiency | ENERGY STAR Most Efficient |
| Smart control | Wi-Fi app |
| Best for | Sunroom, dedicated plant room |

## 4. Pro Breeze 30-Pint Compressor Dehumidifier — Best for large plant collections

[Check price on Amazon](https://www.amazon.com/s?k=Pro%20Breeze%2030-Pint%20Compressor%20Dehumidifier&tag=sktiger-20)

**Pros**

- More capacity for dozens of pots
- Compressor unit for real moisture removal
- Simple controls

**Cons**

- Overkill for a modest collection
- Louder than the Cube 20

**Why we picked it:** When dozens of pots are transpiring at once and you water often, combined moisture output can outrun a small unit. This is the step-up choice once a hygrometer shows the room stays humid even with a smaller machine running.

**Performance:** Pro Breeze sizes it for rooms of roughly 1,500 square feet. Pair it with a small fan moving air between dense plant groupings: university plant-disease guidance stresses that stagnant air drives powdery mildew as much as humidity does, and no dehumidifier fixes still air on its own. For sizing help, see our [dehumidifier size guide](https://www.enthusiastreview.com/guides/dehumidifier-size-guide/).

| Spec | Value |
| --- | --- |
| Capacity | 30 pints/day |
| Type | Compressor |
| Coverage | About 1,500 sq ft (maker) |
| Best for | Large, crowded plant rooms |

## Plant humidity, by the numbers

- **40–60%** — Humidity most common houseplants prefer, per Penn State Extension
- **30–40%** — Typical winter humidity in a home with forced-air heat
- **85%** — Ceiling UC IPM recommends to discourage fungal disease in indoor plant spaces

The gap between the first two numbers is why "too dry" is a far more common houseplant problem than "too humid." Damp-air trouble tends to be local: tightly grouped foliage with little airflow can create a pocket far more humid than the wall-mounted reading suggests.

## How we pick dehumidifiers for plants

We don't grow test plants or run a lab. We started from university extension guidance (Penn State and UC IPM) on houseplant humidity and disease, then matched products to the specific spaces where excess humidity actually occurs: enclosed shelves, sunrooms and dedicated plant rooms.

For each pick we compared published capacity and coverage, whether the humidistat can hold a moderate target rather than just running flat-out, noise for rooms people use, and owner reports. A diagnostic hygrometer comes first because it decides whether you need anything else.

## What to look for in a dehumidifier for plants

- **Proof you need one:** A week of hygrometer readings above 60–70% near your plants. Below 40%, you need a humidifier instead — see [dehumidifier vs. humidifier](https://www.enthusiastreview.com/guides/dehumidifier-vs-humidifier/).
- **A settable humidistat:** Plants want moderate humidity. Choose a unit that stops at a target like 55–60% instead of running continuously.
- **The right scale:** A silica canister for a shelf or closet; a compressor unit for a full room.
- **Airflow, too:** A small fan between plant groupings reduces mildew risk regardless of the room's overall humidity.

## Signs your plant room is too humid

- A powdery white coating on leaves (powdery mildew).
- Fuzzy gray mold on stems, flowers or the soil surface.
- Clouds of tiny fungus gnats when you water.
- Potting mix that stays wet for a week or more after watering.
- Condensation running down windows most mornings.

> **Fix the watering first:** Root rot is driven mainly by waterlogged potting mix. A humid room slows drying, but cutting back on watering often solves more than any dehumidifier will on its own.

## Can you use dehumidifier water for plants?

Generally, yes — for ornamental houseplants. The water in your dehumidifier's tank is condensed from the air, so it starts out very low in dissolved minerals, a bit like distilled water. That makes it appealing for plants that dislike hard tap water. But it isn't sterile or purified, so use it with a few precautions.

1. **Use it fresh.** Water that sits in a warm tank for days can grow bacteria and mold. Empty and use it within a day or so.
2. **Keep the tank clean.** Rinse and wipe the bucket regularly so you're not pouring biofilm onto your plants.
3. **Stick to ornamentals.** Condensate can pick up trace metals or dust from the coils and tank, so most advice is to skip it for edible plants and herbs.
4. **Don't drink it.** It isn't safe for people or pets — see [can you drink dehumidifier water?](https://www.enthusiastreview.com/guides/can-you-drink-dehumidifier-water/).

## Can plants dehumidify a room?

Not in any meaningful way. Some plants are often promoted as natural dehumidifiers because their leaves can take up a little moisture, but overall, plants release water vapor through transpiration — that's why a crowded plant room gets humid in the first place. If a room is genuinely damp, plants won't fix it; ventilation and a dehumidifier will. For other approaches, read [how to dehumidify a room](https://www.enthusiastreview.com/guides/how-to-dehumidify-a-room/).

## The bottom line

Most houseplants want more humidity than a typical home provides, so start with the **AcuRite 01080M Pro** hygrometer before buying anything. If your plant room really does run humid, the **Eva-Dry E-333** handles a shelf or closet, the **Midea Cube 20** holds a sunroom at a plant-friendly target, and the **Pro Breeze 30-Pint** steps up for a large collection. And yes, fresh dehumidifier water from a clean tank is fine for ornamental plants — just not for edibles or for drinking.

## Frequently asked questions

### Can you use dehumidifier water for plants?

Usually, yes, for ornamental houseplants. It's low in minerals, but it isn't purified, so use it fresh from a clean tank and avoid using it on edible plants and herbs.

### Is dehumidifier water good for plants?

It can be helpful for plants that are sensitive to hard tap water, because condensate contains very few dissolved minerals. The main risks are bacteria from a dirty or stagnant tank and trace contaminants from the unit itself.

### Do houseplants need a dehumidifier?

Usually not. Most houseplants prefer 40–60% humidity and tropicals often like more, while many homes run drier than that in winter. A dehumidifier helps only when a crowded plant room stays consistently humid enough to cause mildew, mold or gnats.

### What plants dehumidify a room?

None do so meaningfully. Plants release moisture through transpiration, so a room full of them typically gets more humid, not less.

### Should I get a humidifier or a dehumidifier for my plants?

Check a hygrometer first. Below about 40%, most houseplants benefit from a humidifier. If a plant-filled room stays above 60–70% with condensation or mildew, a dehumidifier is the right tool.

### What humidity causes powdery mildew on houseplants?

High humidity combined with poor airflow is the trigger. UC IPM advises keeping indoor plant spaces below 85% to discourage fungal disease, and a fan between dense plant groupings helps a lot.

## Related guides

- [The Best Dehumidifiers for a Sunroom](https://www.enthusiastreview.com/best/best-dehumidifier-for-sunroom/)
- [The Best Dehumidifiers for Grow Tents](https://www.enthusiastreview.com/best/best-dehumidifier-for-grow-tent/)
- [The Best Greenhouse Dehumidifiers](https://www.enthusiastreview.com/best/best-dehumidifier-for-greenhouse/)
- [The Best Dehumidifiers for a Terrarium (and When You Don't Need One)](https://www.enthusiastreview.com/best/best-dehumidifier-for-terrarium/)
- [Can You Drink Water From a Dehumidifier?](https://www.enthusiastreview.com/guides/can-you-drink-dehumidifier-water/)
- [Dehumidifier vs. Humidifier: Which One Does Your Home Actually Need?](https://www.enthusiastreview.com/guides/dehumidifier-vs-humidifier/)

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*Enthusiast Review researches products against DOE ratings, ENERGY STAR data, manuals, CPSC recalls and owner reviews; it does not run a test lab. Amazon links are affiliate links (tag sktiger-20).*