Can You Grow Pothos in a Fish Tank?

Originally inspired by our journal entry, The Vine That Found the Water.

We Didn't Mean to Do This

If you're looking for a carefully planned experiment, this isn't it.

Our pothos was happily growing in its own pot beside the aquarium. As the months passed, one vine grew longer and longer until it naturally draped over the edge of the tank.

We left it there simply because we liked the way it looked.

Eventually the vine touched the water.

A few weeks later, tiny white roots began to emerge.

The plant had discovered the aquarium before we realized what was happening.

That one unexpected moment changed the way we think about both houseplants and aquariums.

What Happened Next

Over the following months, we watched the plant closely.

The roots grew surprisingly fast. Once they reached the water, they developed into long, healthy white roots that stretched beneath the surface.

The leaves never slowed down.

Although one vine had rooted into the aquarium, the original plant continued producing new vines from its pot as if nothing had changed.

The fish seemed to love it.

The roots became another part of the underwater landscape. Fish explored them, rested beneath them, and swam through them just as they would any aquatic plant.

Most importantly, the aquarium remained healthy.

Many aquarists intentionally grow pothos to help absorb excess nitrates from the water. While that wasn't our original goal, we were pleased to see both the aquarium and the plant continue to thrive together.

Can You Grow Pothos in a Fish Tank?

Absolutely.

As long as the leaves remain above the water and only the roots are submerged, pothos can thrive using nutrients already present in aquarium water.

Think of the aquarium as extending part of the plant's root system, not replacing the entire pot.

Many aquarium hobbyists intentionally grow pothos this way because the roots naturally absorb excess nutrients while creating beautiful shelter for fish beneath the surface.

Note: Pothos leaves should always remain above the water. Only the roots and lower stem should be submerged.

How to Grow Pothos in a Fish Tank

1. Start with a healthy pothos.

A mature plant already growing in soil works best because it has an established root system and plenty of energy to support new growth.

2. Let a vine reach the aquarium.

Instead of cutting the plant, allow one healthy vine to naturally grow toward the aquarium. If needed, gently guide it over the edge.

We've found this produces stronger growth than placing fresh cuttings directly into the water.

3. Keep the leaves above the surface.

Only the roots and lower stem should touch the water.

The leaves should always remain dry.

4. Be patient.

It took several weeks before we noticed the first tiny white roots.

Nature almost always works slower than we expect.

5. Let the plant decide.

Once roots begin to grow, resist the urge to move the vine around.

Pothos has an incredible ability to decide where it wants to grow when given the opportunity.

What We Learned

Like many experiments around our home, this one didn't stop with a single plant.

After seeing how well the original pothos responded, we began taking cuttings from other pothos throughout the house. We tucked those cuttings into the aquarium filter where the stems stayed moist while the leaves remained above the water.

The results were encouraging.

Nearly every cutting rooted successfully.

Some remained in the aquarium for almost a year, producing beautiful white roots and staying perfectly healthy.

But something surprised us.

Although the cuttings rooted exceptionally well, they didn't seem eager to produce new growth. They stayed alive and healthy, but new leaves appeared slowly and the vines changed very little.

The original plant told a different story.

Because it remained rooted in soil while one mature vine discovered the aquarium naturally, it seemed to benefit from both environments. The established roots continued drawing nutrients from the soil while the aquatic roots explored an entirely different source of water and nutrients.

That plant exploded with growth.

Its leaves became noticeably larger.

Its vines stretched farther.

Its overall vigor far outpaced any cutting we left growing solely in the aquarium.

That observation completely changed the way we propagate pothos today.

How We Do It Today

Today, every rescued pothos follows the same journey.

We begin by rooting fresh cuttings in one of our aquariums. The warm, oxygen-rich water encourages healthy roots to develop quickly with very little effort.

Once those roots are well established, we transplant each cutting into soil and allow it to mature like any other houseplant.

Then we wait.

Eventually a vine becomes long enough to wander toward the aquarium again.

When it finds the water on its own, we let it.

So far, this approach has consistently produced our healthiest, fastest-growing pothos plants.

It also feels more natural.

Final Thoughts

This page isn't meant to be the final word on growing pothos in aquariums.

It's simply a record of what we've observed in our own home.

Every aquarium is different.

Every house is different.

Every plant grows at its own pace.

We'll continue updating The Ledgeras our little ecosystem changes because that's what The Living Ledger is all about paying attention, learning as we go, and keeping a record of the ordinary moments that quietly teach us something new.

If you'd like to read the story that inspired this experiment, you can find it in The Vine That Found the Water.