Can Ferns Grow in Water? | Choose Water or Soil Wisely

Yes, some ferns can grow in water, but most common houseplant ferns need moist, well-draining soil and will rot in standing water.

You’ve probably seen those lush ferns in every hardware store and wondered if you could just plop one in a vase on your desk. No soil, no mess, just water. It looks so simple.

The truth is trickier. Some ferns are true aquatic plants that can live underwater. Most are not. If you pick the wrong one, that pretty vase will turn into a sad, brown mess within weeks.

Aquatic Ferns vs. Terrestrial Ferns — The Key Distinction

To answer the question, you need to separate two very different plant groups. Think of it like fish and dogs — both are pets, but they live in completely different environments.

True aquatic ferns, like Java fern and water sprite, have adapted to live fully submerged. Their fronds are softer and more delicate, and they absorb nutrients directly from the water through their leaves rather than through soil roots.

Terrestrial ferns — the Boston fern, maidenhair fern, and staghorn fern you’re used to seeing in pots — need their roots in moist but not waterlogged soil. Standing water suffocates their root system and causes rot within days.

Why People Assume All Ferns Love Water

Ferns have a reputation for needing constant moisture. Plant tags always say “keep soil moist,” and you see them thriving in humid bathrooms and shaded forests. That mental image makes “growing in water” seem like a natural next step.

The confusion is understandable, but the distinction matters. Moist soil and standing water are two entirely different conditions. Ferns need consistent moisture in the air and soil, but their roots still need oxygen.

• Humidity vs. waterlogging: Ferns love humid air. They hate soggy roots. Misting the leaves is beneficial; submerging the roots is not.
• Drainage is non-negotiable: A pot of soil can hold moisture while letting excess drain. A vase of standing water provides no drainage, which is why most ferns die in one.
• Nutrient delivery differs: In soil, roots pull nutrients from organic matter. In plain water, aquatic ferns absorb dissolved minerals through their fronds. Terrestrial ferns can’t switch modes.
• Algae and rot risk: Still water promotes algae growth and bacterial rot, especially in warm indoor environments where most people keep ferns.
• Only specific species adapt: Java fern, water sprite, and Anubias are the common aquarium plants. Your grocery store Boston fern is not one of them.

This is why reading the plant tag matters. Most ferns will grow well in moist soil, but some prefer drier conditions; always read the plant tag for specific care instructions, as advised in the ferns moist soil guide from ScottsMiracle-Gro.

Which Ferns Actually Grow in Water?

The short list of ferns that can live fully submerged is short. Java fern is the most common. Water sprite is another option. Both are sold primarily as aquarium plants, not as houseplants.

If you’re determined to grow a fern in a vase or jar, these are your best candidates. Gardenbloomvibes explains that true aquatic ferns like Java fern and water sprite can grow beautifully fully submerged, provided they get adequate light and occasional liquid fertilizer.

For everyone else, the rule is simple: keep the soil moist and the roots out of standing water. That’s how most ferns live long, healthy lives indoors.

Note that hydroponic systems are different from a simple vase of water. They circulate oxygen and nutrients, which mimics healthy soil conditions rather than stagnant water. Some gardening sites report that hydroponic ferns may grow faster, but those results vary by setup and species.

How to Try Growing a Fern in Water (If You Must)

If you want to experiment, start with an aquatic fern from a pet store, not a houseplant fern from a nursery. Even then, success requires a few specific conditions.

1. Choose the right species: Buy Java fern or water sprite from an aquarium supplier. A Boston fern from the hardware store will fail.
2. Use filtered or dechlorinated water: Tap water chemicals can damage delicate aquatic fronds. Let water sit out for 24 hours before using it.
3. Provide indirect light: Aquatic ferns need bright but indirect light, just like their terrestrial cousins. Direct sun heats the water and promotes algae.
4. Add liquid fertilizer occasionally: Plain water lacks the nutrients ferns need. A few drops of aquarium plant fertilizer every few weeks helps.
5. Change the water weekly: Stagnant water breeds bacteria and algae. A weekly refresh keeps the fern healthy longer.

Even with perfect care, aquatic ferns in a vase won’t grow as vigorously as they would in an aquarium with a filter and circulation. They’re more of a short-term decorating trick than a long-term plant solution.

Soil Ferns: What They Actually Need to Thrive

For the vast majority of fern owners, soil is the better path. The key is balancing moisture with drainage, which is what ferns evolved for in the first place.

Brooklyn Botanic Garden recommends providing ferns with plenty of humidity, generous watering, and sufficient light without direct sun exposure. They also emphasize that ferns need rich, well-draining soil — not heavy garden soil that holds water like a sponge.

Part of that drainage strategy is the pot itself. If your fern pot lacks drainage holes, water collects at the bottom and the roots sit in a puddle. A non-draining pot is essentially a vase of water at the roots, which most ferns cannot tolerate for long.

Scotti’s guide notes that water newly planted ferns regularly for at least their first year; after that, most only need extra water during long dry spells. This pattern mimics their natural life cycle — establishment, then maintenance.

Epsom salt is sometimes mentioned by gardeners as a fern booster, but it must be dissolved fully to avoid leaf burn. This is more of a gardener’s trick than a scientifically guaranteed benefit, so use it sparingly if at all.

The Bottom Line

Yes, some ferns grow in water — specifically aquatic species like Java fern and water sprite. Most houseplant ferns, however, need moist, well-draining soil and will rot if their roots sit in standing water. If your goal is a low-mess, no-soil plant, an aquatic fern in a vase can work, but it requires regular water changes and occasional fertilizer.

For the ferns you find at garden centers, stick to a pot with drainage holes and soil that stays moist but never soggy — your local nursery or a trusted online guide can help you match the right fern to your home’s light and humidity.