If you’ve spent any time looking at houseplant advice online, you’ve probably encountered people who swear that bottom watering is the secret to healthier plants.
Instead of pouring water over the top of the soil, you sit the plant pot in water and allow the compost to soak it up from underneath.
It’s tidy. It’s satisfying. And watching bone-dry soil gradually darken as it absorbs water is weirdly enjoyable.
But is bottom watering actually better for houseplants?
Sometimes.
Bottom watering can be brilliant for thoroughly rehydrating dry soil, watering plants with dense foliage and encouraging an even distribution of moisture through the pot.
But it isn’t automatically better than top watering, and there are some good reasons not to use it every single time.
Here’s how bottom watering works, which houseplants benefit from it, how long to leave your plants soaking and when you’re better off reaching for the watering can.
If your biggest question is simply when to water rather than how, start with How Often Should You Water Houseplants?
What Is Bottom Watering?
Bottom watering means allowing a plant to absorb water through the drainage holes at the bottom of its pot rather than pouring water onto the surface of the soil.
You place the plant pot into:
- A bowl
- Sink
- Bath
- Deep plant saucer
- Watering tray
containing a few centimetres of water.
The potting mix gradually absorbs water upwards through capillary action.
Once the soil has taken up enough water, you remove the plant and allow any excess to drain away.
It’s simple — but there are a few tricks to doing it properly.
Bottom Watering vs Top Watering
Both methods can water a houseplant successfully.
The main difference is where the water enters the pot.
Top watering
Water is poured onto the soil surface and moves down through the pot before excess drains from the bottom.
Bottom watering
Water enters through drainage holes and is drawn upwards into the potting mix.
Neither method is universally “correct”.
In fact, for many houseplants, using both methods at different times can be more useful than committing exclusively to one.
Is Bottom Watering Good for Houseplants?
Yes, bottom watering can be very useful.
It can help:
- Thoroughly rehydrate dry compost
- Encourage more even moisture through the pot
- Keep water away from sensitive leaves
- Reduce disturbance to the soil surface
- Water plants with dense foliage
- Rehydrate soil that’s beginning to repel water
But it has disadvantages too.
Most importantly, regularly watering exclusively from below means you’re not flushing accumulated mineral salts out through the drainage holes.
We’ll come back to that.
How to Bottom Water Houseplants Step by Step
Fortunately, you don’t need any special equipment.
Step 1: Check that the pot has drainage holes
This is essential.
Water needs to enter through the bottom of the pot.
If your plant is sitting directly inside a decorative pot with no drainage holes, you can’t bottom water it properly.
This is one reason I generally like keeping houseplants in a plastic nursery pot inside a decorative cover pot.
Step 2: Fill a container with water
Use a sink, bowl, bath or deep tray.
You don’t need to submerge the entire pot.
A few centimetres of water around the base is usually enough for the potting mix to begin absorbing moisture.
Step 3: Put the plant into the water
Place the nursery pot into the container.
Make sure the drainage holes are actually in contact with the water.
Then leave it alone.
The compost will begin drawing moisture upwards.
Step 4: Check the top of the soil
After a while, feel the soil near the surface.
You may notice that it has become slightly damp as moisture travels upwards through the pot.
You don’t necessarily need the very top layer to become soaking wet.
The aim is to thoroughly hydrate the root zone.
Step 5: Remove the plant
Once the soil has absorbed enough water, lift the pot out.
Let excess water drain freely.
Don’t immediately put a dripping nursery pot back inside a sealed decorative pot.
Otherwise your beautifully bottom-watered plant can end up sitting in a puddle — which rather defeats the object.
How Long Should You Bottom Water a Houseplant?
For many ordinary houseplants, around 10–30 minutes is a reasonable range to start checking.
But don’t treat 20 minutes as some magical universal number.
A tiny Pothos in a 10 cm pot may absorb enough water relatively quickly.
A large plant in a chunky growing medium may take longer.
Factors affecting absorption include:
- Potting mix
- How dry the soil is
- Root density
- Material of the pot
- Depth of the water
Instead of relying entirely on a timer, check the soil.
If the root zone feels adequately moist, you’re done.
If the compost is still completely dry after half an hour, you may have a different problem.
Why Isn’t My Plant Absorbing Water From the Bottom?
This is worth paying attention to.
If a plant sits in water but the soil remains stubbornly dry, the compost may have become hydrophobic.
That means the growing medium has dried so thoroughly that it begins repelling water rather than readily absorbing it.
Very dry peat-based mixes can be particularly prone to this.
You might also notice that when you top water, liquid immediately:
- Runs down the side of the pot
- Pours through the drainage holes
- Leaves the centre of the root ball dry
Bottom watering can sometimes help gradually rehydrate the soil because it gives the compost longer to absorb moisture.
If that doesn’t work, the plant may need further attention or fresh growing medium.
What Are the Benefits of Bottom Watering?
There are several situations where watering from below is particularly useful.
1. It can rehydrate very dry soil
If water immediately races through your pot without seeming to wet anything, a slow soak from below can give the growing medium time to absorb moisture properly.
This is one of my favourite reasons to bottom water.
2. It can provide more even moisture
When top watering quickly, it’s possible for water to find easy channels through the compost.
Some sections become wet while others remain surprisingly dry.
Bottom watering gives the potting mix time to absorb moisture gradually.
3. It keeps foliage dry
Some plants have leaves that don’t particularly appreciate repeatedly being soaked.
Bottom watering lets you hydrate the roots without pouring water through dense foliage.
This can be particularly convenient for plants with:
- Fuzzy leaves
- Dense rosettes
- Crowded foliage
4. It doesn’t disturb the soil surface
Pouring water heavily onto a small pot can displace compost, expose roots or send perlite floating everywhere.
Bottom watering avoids that.
This makes it particularly useful for:
- Small pots
- Young plants
- Seedlings
- Recently rooted cuttings
If you’ve recently propagated a new plant, see What Do You Need to Propagate Plants? for a complete beginner setup.
5. It can be easier for a large plant collection
If you have several small plants, you can place multiple nursery pots into a large watering tray and let them soak at the same time.
That can be much easier than carefully watering every individual pot.
👉 Shop deep plant watering trays
Does Bottom Watering Encourage Stronger Roots?
You’ll sometimes see claims that bottom watering automatically produces stronger or deeper root systems because roots “grow down towards the water”.
I wouldn’t choose bottom watering on that basis alone.
Healthy root development depends on far more than which end of the pot the water entered.
Roots need:
- Appropriate moisture
- Oxygen
- Suitable growing medium
- Enough space
- Healthy temperatures
- A healthy plant above the soil
The real advantage of bottom watering is often simply more thorough and even hydration.
What Are the Disadvantages of Bottom Watering?
This is the bit that sometimes gets missed.
Bottom watering isn’t perfect.
1. It Doesn’t Flush the Soil
When you thoroughly top water a plant and allow water to run through the drainage holes, some accumulated soluble salts can be carried out with the drainage water.
Those salts can come from:
- Fertiliser
- Tap water
- The potting medium itself
If you only ever bottom water, those minerals aren’t being flushed through the pot in the same way.
Over time, you may notice a white crust appearing on:
- Soil
- Pot rims
- Terracotta
That’s one reason I wouldn’t exclusively bottom water most houseplants forever.
An occasional thorough top watering can help flush the growing medium.
2. It’s Slower
Top watering takes seconds.
Bottom watering means finding a suitable container, filling it, soaking the plant and then letting it drain.
For three plants, that’s fine.
For 73 plants?
You’ve accidentally created yourself a part-time job.
3. Sharing Water Can Spread Problems
If several plants sit in the same watering tray, water can potentially move pests, pathogens or contaminated material between pots.
I wouldn’t put a plant with a suspected pest or disease problem into communal watering water with the rest of the collection.
Keep questionable plants separate.
If you’ve spotted something suspicious, our Houseplant First Aid Kit guide covers useful supplies to keep ready for common plant problems.
4. It’s Easy to Forget the Plant
You put the plant in the sink.
You wander away.
You make coffee.
You answer an email.
Three hours later, your Pothos is still having a bath.
A slightly overlong soak isn’t automatically catastrophic, but don’t routinely leave pots sitting in water for hours.
Can You Overwater a Plant by Bottom Watering?
Yes — because overwatering isn’t really about which direction the water comes from.
The bigger issue is how long the roots remain in excessively wet, poorly aerated soil.
A plant can be overwatered whether you add water from the top or the bottom.
If you bottom water a plant thoroughly and then wait until it genuinely needs water again, that’s very different from soaking it every two days while the compost is still wet.
If your soil remains wet for days or even weeks after watering, investigate why before adding more.
Related reading: Why Does My Houseplant Soil Stay Wet for So Long?
Can You Bottom Water Every Time?
You can, but for most ordinary houseplants I wouldn’t make it an absolute rule.
Alternating methods can give you the benefits of both.
For example:
Most watering: whichever method works best for you.
Occasionally: thoroughly top water and allow plenty of water to drain through the pot.
That helps flush accumulated salts.
You don’t need an elaborate schedule.
Plant care really doesn’t need another spreadsheet.
Does Bottom Watering Prevent Fungus Gnats?
This one needs a qualified answer.
Fungus gnats lay eggs in moist organic growing medium, and their larvae live primarily in the upper layers.
Keeping the very top of the soil drier can make conditions less attractive for them.
Because bottom watering doesn’t directly soak the surface, it can sometimes help keep the upper layer drier.
But bottom watering is not a fungus gnat treatment on its own.
If the whole pot remains constantly damp, you’ve still created conditions fungus gnats can enjoy.
Already seeing tiny flies?
Read How to Get Rid of Fungus Gnats in Houseplants rather than relying on watering technique alone.
Which Houseplants Like Bottom Watering?
Most houseplants grown in pots with drainage holes can be bottom watered.
It’s particularly convenient for plants where you want to avoid repeatedly wetting the foliage.
African violets
Their fuzzy leaves can develop marks or damage when water repeatedly sits on them.
Bottom watering is therefore particularly convenient.
Cyclamen
Their dense growth and central crown can make careful top watering awkward.
Small ferns
Bottom watering can help evenly hydrate small pots, although don’t assume every fern wants permanently soggy soil.
Small propagated plants
Young root systems and lightweight compost can easily be disturbed by aggressive top watering.
Dense trailing plants
When foliage completely covers the top of the pot, getting a watering can underneath can become irritating.
Which Plants Shouldn’t You Bottom Water?
There aren’t many ordinary houseplants that categorically cannot be bottom watered.
The more useful question is whether bottom watering suits the plant’s growing medium and moisture requirements.
Be cautious with plants that need their soil to dry significantly between waterings.
That includes many:
- Succulents
- Cacti
- Drought-tolerant plants
You can still bottom water them.
Just don’t interpret bottom watering as permission to keep their soil permanently moist.
A thorough watering followed by appropriate drying is still important.
Should You Bottom Water Succulents?
You can.
In fact, a thorough bottom watering can be useful if a very dry succulent mix is struggling to absorb water evenly.
Let the pot soak until the growing medium is properly hydrated, then remove it and allow it to drain completely.
The crucial part comes afterwards:
don’t water again until the plant actually needs it.
Succulents generally cope much better with a proper soak followed by drying than frequent little sips of water.
Should You Bottom Water Orchids?
This depends heavily on what the orchid is growing in.
Many common Phalaenopsis orchids are grown in chunky orchid bark rather than conventional potting compost.
Bark behaves differently from ordinary houseplant soil and may benefit from soaking, but orchid watering deserves its own approach.
If orchids are your current nemesis, head to our Orchid Care Tips for Beginners rather than treating them exactly like your other houseplants.
Is Bottom Watering Better for Pothos?
Pothos doesn’t require bottom watering.
It’s perfectly happy being watered thoroughly from above.
However, bottom watering can be useful if:
- The soil has become extremely dry
- Water is running straight through
- The plant is very dense
- You want to rehydrate the root ball evenly
The important thing is still allowing the soil to dry appropriately before watering again.
Can You Bottom Water Plants in Terracotta Pots?
Yes.
Terracotta is porous, so you may notice the pot itself absorbing water and becoming darker during soaking.
That’s normal.
Because moisture can also evaporate through terracotta, plants in these pots may dry faster than identical plants in plastic containers.
Can You Bottom Water a Plant in a Decorative Pot?
Only if the actual growing pot has drainage holes.
If your plant is sitting in a plastic nursery pot inside a decorative cover pot, take the nursery pot out and soak that.
Then allow it to drain before returning it to the cover pot.
Don’t simply pour water into the bottom of a sealed decorative pot and leave the nursery pot sitting in it indefinitely.
That’s not bottom watering.
That’s a swamp.
What Kind of Container Do You Need for Bottom Watering?
Almost anything waterproof and deep enough to hold a few centimetres of water.
You could use:
- Kitchen sink
- Washing-up bowl
- Storage tub
- Deep plant saucer
- Seedling tray
- Bath
You absolutely do not need to buy a special bottom-watering device.
However, if you have a lot of small plants, a reusable watering tray can make the process easier.
Do Self-Watering Pots Count as Bottom Watering?
Sort of — but they’re not exactly the same thing.
Self-watering pots usually contain a reservoir beneath the plant.
Water is drawn upwards into the growing medium, often through a wick or contact with part of the substrate.
The principle of water moving upwards is similar.
The difference is that a self-watering system is designed to provide access to moisture over a longer period rather than giving the pot an occasional soak and then removing it.
👉 Shop self-watering pots for houseplants
They’re useful for some plants, but they don’t remove the need to understand how much moisture your particular plant actually likes.
Top Watering vs Bottom Watering: Which Is Better?
Honestly?
Neither wins.
Bottom watering is particularly useful for:
- Rehydrating very dry soil
- Small pots
- Dense foliage
- Keeping leaves dry
- Watering several small plants together
Top watering is particularly useful for:
- Speed
- Large plants
- Flushing salts through the soil
- Seeing how quickly your pot drains
- Everyday convenience
For many houseplants, the best approach is simply to use whichever makes sense at the time.
You don’t have to pick a team.
How Do You Know When a Plant Needs Water?
This matters considerably more than whether you water from above or below.
Don’t water purely because:
It’s Sunday, therefore Sunday is watering day.
Different plants dry at different rates.
And even the same plant may use water differently depending on:
- Season
- Temperature
- Light
- Humidity
- Growth
- Pot size
- Pot material
Check the soil before watering.
You can:
- Feel it with your finger
- Lift the pot and judge its weight
- Use a wooden skewer
- Look through clear nursery pots
- Use a moisture meter as an additional guide
👉 Shop houseplant moisture meters
For a full guide, read How Often Should You Water Houseplants?
What If Your Soil Stays Wet After Bottom Watering?
If the soil remains saturated for a very long time, bottom watering itself may not be the real problem.
Look at:
Pot size
A small plant in a huge pot can be surrounded by far more wet soil than its roots can use.
Drainage
Make sure excess water can actually escape.
Potting mix
Dense, compacted growing medium may hold too much moisture.
Light
Plants generally use water more slowly in low light.
Temperature
Cooler conditions can slow growth and water use.
Root health
Damaged roots may struggle to absorb water normally.
If you’re repeatedly waiting forever for pots to dry, read Why Does My Houseplant Soil Stay Wet for Days or Weeks?
What If Water Runs Straight Through the Pot?
This is almost the opposite problem.
If you pour water onto the soil and it immediately shoots out of the bottom while the root ball remains dry, you could be dealing with:
- Hydrophobic soil
- Compacted growing medium
- Gaps between the soil and pot
- A severely rootbound plant
Bottom watering is one of the first things I’d try because it gives the growing medium time to slowly absorb water.
If the plant still refuses to hydrate properly, it may be time to investigate the roots and potentially repot.
Related reading: Beginner’s Guide to Repotting Houseplants
Bottom Watering Mistakes to Avoid
Leaving the pot soaking indefinitely
Once the root zone is adequately moist, take it out.
Bottom watering soil that’s already wet
Check first.
Forgetting to let the pot drain
Don’t transfer a dripping plant straight into a watertight cover pot.
Using communal water for unhealthy plants
Keep pest- or disease-affected plants separate.
Never top watering
An occasional thorough top watering can help flush accumulated salts.
Assuming bottom watering prevents overwatering
It doesn’t.
You can absolutely overwater using either method.
My Bottom Watering Routine for Houseplants
If I decide a plant would benefit from bottom watering, I keep it very simple.
- Check that the plant actually needs water.
- Put a few centimetres of water into a bowl or sink.
- Place the nursery pot in the water.
- Leave it to absorb moisture.
- Check the soil after around 10–20 minutes.
- Give it longer if necessary.
- Remove it once the root zone is hydrated.
- Let it drain thoroughly.
- Return it to its normal position.
No special products.
No complicated schedule.
No need to turn watering a Pothos into a scientific experiment.
Frequently Asked Questions About Bottom Watering
Is bottom watering better than top watering?
Not universally. Bottom watering is excellent for evenly rehydrating dry soil and avoiding wet foliage, while top watering is quicker and helps flush accumulated salts from the growing medium. Both methods have advantages.
How long should I bottom water my houseplants?
Start checking after around 10–30 minutes. The exact time depends on pot size, growing medium and how dry the plant is. Remove the pot once the root zone has absorbed sufficient moisture.
Can I leave a plant bottom watering overnight?
There’s generally no reason to. Once the soil is adequately hydrated, remove the plant and allow excess water to drain.
Can bottom watering cause root rot?
Bottom watering doesn’t inherently cause root rot, but repeatedly watering while the soil is still wet or allowing the plant to remain saturated for prolonged periods can contribute to unhealthy root conditions.
Does bottom watering get rid of fungus gnats?
No. It may help keep the upper layer of soil drier, but it won’t eliminate an existing fungus gnat infestation by itself.
Should I bottom water every time?
You don’t need to. Occasional top watering is useful for flushing accumulated salts through the growing medium.
How deep should the water be for bottom watering?
You generally only need a few centimetres of water around the bottom of the pot. The drainage holes need to be in contact with the water so the growing medium can begin absorbing it.
Why won’t my plant absorb water from the bottom?
Very dry or hydrophobic potting mix can resist water. Give it more time to absorb moisture. If the root ball remains dry despite soaking, inspect the condition of the soil and roots.
Can I add fertiliser when bottom watering?
Some water-soluble fertilisers can be applied through bottom watering if the product instructions permit it. Always follow the manufacturer’s dilution and application instructions rather than assuming every fertiliser can be used this way.
Can you bottom water plants without drainage holes?
No. Bottom watering relies on water entering through drainage holes. A plant growing directly in a pot without drainage needs a different setup — and I’d generally consider whether it would be happier in a nursery pot with drainage.
Final Thoughts
Bottom watering is useful.
It just isn’t magic.
It can thoroughly rehydrate dry soil, make watering awkward plants easier and help moisture spread more evenly through the growing medium.
But it doesn’t prevent overwatering, it doesn’t cure fungus gnats, and it doesn’t automatically produce vastly superior roots.
For most houseplants, you don’t need to choose between top watering or bottom watering forever.
Use the method that suits the plant and situation.
Bottom water when a plant would benefit from a slow, thorough soak.
Top water when it’s convenient — and occasionally to flush the soil.
And most importantly, check whether the plant actually needs water before doing either.
Because getting the timing right matters far more than whether the water entered from the top or the bottom.
Continue Reading
If you’re figuring out your houseplant watering routine, read these next:
- How Often Should You Water Houseplants?
- Why Does My Houseplant Soil Stay Wet for Days or Weeks?
- Why Is My Houseplant Drooping?
- Why Are My Houseplant Leaves Turning Yellow?
- How to Get Rid of Fungus Gnats in Houseplants
- Beginner’s Guide to Repotting Houseplants
- Houseplant First Aid Kit: What You Actually Need
- What Do You Need to Propagate Plants?