How to Care for Ceratopteris thalictroides (Water sprite)

Korean name: 물수세미

This aquatic fern features delicate, lace-like leaves that are beautiful. It can be grown either floating or submerged in an aquarium.

Key facts

Care Guide

Detailed care guide

Water sprite is an aquatic fern with beautiful, delicate lace-like leaves. It grows well whether floated on the water's surface in an aquarium or fully submerged.

Watering

Water sprite is always grown in water, so no separate watering is needed. It grows well fully submerged or floating on the surface, and if water is lacking, the leaves can dry out or the tips can turn brown.

Light

Bright indirect light works best. If light is lacking, the stems grow long and can flop weakly, so keep the aquarium in a bright spot.

Humidity

Since it always grows in a water environment, maintaining moisture in the water is essential. Check often to make sure the water isn't evaporating.

Temperature

It grows healthiest between 22–28°C. If the temperature is too low, growth slows, and if too high, the leaves can be damaged easily.

A common first-timer mistake

At first, it's common to place it somewhere with too little light. Making sure it gets bright indirect light will help it grow healthy.

If you have pets

Water sprite has no known toxicity to pets. That said, eating too much of any plant can cause an upset stomach, so move it out of reach if your pet chews on it habitually.

Care by Season

As long as the temperature stays steady year-round and the aquatic environment is maintained, water sprite grows reliably in all four seasons. In winter, it's important to keep the indoor temperature above 22°C. If the water temperature drops, growth may temporarily slow, but it doesn't go dormant, so just make sure the water level doesn't drop.

Common Problems and Fixes

If the water is insufficient and stems are exposed above the water, the leaf tips can turn brown, so always keep enough water. Too much fertilizer can turn the leaves yellow or mushy. If light is lacking, the stems grow long and the spacing between leaves widens, so pay attention to the brightness of the room where the aquarium sits.

Repotting and Propagation

Water sprite has delicate roots, so it doesn't need to be moved often. When grown floating, trim it back or remove healthy leaves to propagate them in another tank once it becomes too dense. When grown submerged, if the leaves get too old, the growth point weakens, so it's best to take fresh stems or leaves and replant them.

Who It's Great For

It's a great match for anyone who wants a clear aquarium with a cool, refreshing feel. It's easy to grow without special equipment, making it a great recommendation for anyone new to aquatic plants or looking for decorative aquarium greenery. If your indoor air is dry or sunlight is weak, you can still grow it easily using artificial lighting.

Written by AI from the care facts in this entry. Treat it as a starting point.

Common questions

How often should you water Ceratopteris thalictroides?

Fully submerged or floating cultivation.

Where should you keep Ceratopteris thalictroides?

It likes Bright indirect light.. You can grow it indoors. Use Fine sand or no soil for floating..

Is Ceratopteris thalictroides safe around pets?

No known toxicity, so it is fine to keep around pets.

Is Ceratopteris thalictroides good for beginners?

Difficulty: Easy. It is forgiving enough for a first plant. Keep it around 22~28°C. Humidity: Underwater cultivation.. Fertilise Liquid fertilizer for aquatic plants once a week..