# Marsh fern: planting, care and where it grows

> Marsh fern (Thelypteris palustris) is a native fern of 0.5 to 1 metre for wet soil. How to recognise it, how to plant it and what to do when it goes wrong.

Canonical: https://tuinontwerp.app/en/blog/marsh-fern
Last updated: 2026-09-28

*Thelypteris palustris*

![One loose group of marsh fern in an empty, wet border by a garden pond in July, with light green fronds that each rise on their own long stalk](https://tuinontwerp.app/images/blog/moerasvaren-26e7d11b.webp)

Published: 2026-09-28

Marsh fern (Thelypteris palustris) is a native fern for wet soil, in sun or
partial shade. The light green fronds rise one by one on long, straw-coloured
stalks. In a garden the plant grows half a metre to a metre tall. Over the
years, a thin, creeping rhizome turns it into a loose colony.

## Marsh fern at a glance

| Feature | Marsh fern |
| --- | --- |
| Height | 0.5 to 1 m |
| Spread | 0.5 to 1 m, spreads out |
| Full grown after | 5 to 10 years |
| Sun | Full sun to partial shade |
| Soil | Wet to moist, acid to neutral |
| Water | Plenty: it belongs in wet soil |
| Maintenance | Low: no pruning |
| Flowers | Does not flower: ferns make spores |
| For bees | No: no flowers |
| Hay fever | No pollen |
| Leaves | Drop in autumn |
| Hardy | Yes |
| Native | Yes |
| Poisonous | No, as far as is known |
| Pricks or stings | No |
| Price, young | About €4.05 to €6.18 each, 5-10 cm, in a small pot |
| Price, grown | Not for sale |

- **Leaf**: May to October
- **Flower**: no showy flowers
- **Fruit**: no noticeable fruit

![One light green marsh fern frond on a thin stalk, with narrow, deeply cut leaflets that stand straight out from the midrib](https://tuinontwerp.app/images/blog/moerasvaren-leaf-19df7e32.webp)
*Leaf*

## How do I recognise marsh fern?

Start with the way the fronds come out of the ground. Marsh fern sends them up
scattered, each on its own, sometimes with a few closer together. The frond is
light green and smooth, without hairs. Its stalk is brittle and at least half as
long as the leafy part. Narrow leaflets line the midrib, each one deeply cut.

Round clusters of spores sit on the underside of some fronds. The edge of the
frond curls over and covers most of each cluster.

Do not confuse marsh fern with male fern (Dryopteris filix-mas). Male fern
holds its fronds together in bundles. The stalk of male fern is also thick with
large, golden-yellow scales.

## Where does marsh fern grow best?

Marsh fern grows in sun and in partial shade. Partial shade means three to six
hours of direct sun a day around midsummer. The fern also needs wet or moist
soil. Acid to neutral clay or loam suits it well. In the wild, marsh fern grows
in peat bogs, beside ponds and in swampy woodland.

> **Did you know?**
>
> Marsh fern sometimes grows on a floating mat of peat and roots on open water.
> The fern has also been found on canal walls and lock walls.

Two kinds of spot are hard for this fern:

- **Dry sand in a sunny front garden.** The fern comes from marshes, and its
  fronds shrivel where the soil dries out.
- **A narrow border between perennials.** The rhizome wanders under the soil
  and can take over among your other plants.

In winter no green fronds are left.

![One border in front of a wooden fence, in two halves: on the left in July a group of light green marsh fern, on the right in January only flat, brown dead fronds on the ground, with a box ball at each end](https://tuinontwerp.app/images/blog/moerasvaren-1-21e350f0.webp)
*The same border in July and in January. This is a generated image, not a photo.*

A colony that keeps growing deserves a permanent place on the wet side of your
garden. A plan of your own plot, to scale and with the houses around it, lets
you choose that place before planting.

## Planting and caring for marsh fern

Nurseries sell marsh fern in a small pot. A potted plant like that can go in at
any time of year, as long as the ground is not frozen. Keep about 35 cm between
plants, which comes to about 8 per square metre. On planting day there is still
bare soil between them. Later the creeping rhizomes fill the gaps.

By a pond, plant the fern on the edge, with its base level with the water. In
the first year, water as soon as the soil feels dry.

Marsh fern needs no pruning. The dead fronds can stay on the ground through
the winter.

## Marsh fern problems and what to do

**The fronds turn brown and dry.** The soil is too dry for this fern. Water
the plant, or move it to a wetter spot.

**Suddenly the fern is all over the border.** The rhizome creeps and can take
over. Cut off the runners at the edge with a spade and plant them somewhere
else.

**All the fronds are gone in autumn.** That is normal, because marsh fern is
not an evergreen fern. New fronds appear from May.

**No flowers ever appear.** That is right: ferns make spores, not flowers and
not seed.

Pests and diseases rarely trouble marsh fern.

## Which insects and birds use marsh fern?

Marsh fern gives no nectar or pollen. The caterpillars of two moths do eat the
fronds. The brown silver-line (Petrophora chlorosata) lives on bracken and
marsh fern. This moth is common, especially on sandy soils, but the provisional
red list rates it as vulnerable.

The splendid brocade (Lacanobia splendens) lives on various marsh plants,
mainly marsh fern and [woody nightshade](https://tuinontwerp.app/en/blog/woody-nightshade). This moth
is rare and endangered. It lives mainly in the low-lying peat areas in the west
of the country.

There is no description of which birds use marsh fern.

## Is marsh fern poisonous or edible?

No poisonings from marsh fern are known. Some ferns do contain substances that
can cause cancer. Many ferns also contain a substance that breaks down vitamin
B. The absence of poisoning reports does not make marsh fern edible.

The photos on this page were made with AI, based on real photos and descriptions of this plant.

## Frequently asked questions

### How tall does marsh fern grow?

In a garden, marsh fern grows half a metre to a metre tall. Through its creeping rhizome, one plant slowly becomes a loose colony.

### Can marsh fern grow in full sun?

Yes. Marsh fern grows in sun and in partial shade, as long as the soil stays wet or moist.

### Does marsh fern need pruning?

No, pruning is not needed. The fronds die back in autumn, and the fern comes up again in May.

### Does marsh fern spread?

It can. The thin rhizome creeps along under the soil. In a small border, cut off the runners at the edge with a spade.

### Is marsh fern poisonous?

No poisonings from marsh fern are known. That does not make the plant edible.

## Sources

- [Duistermaat, Sparrius & Denters, Standaardlijst van de Nederlandse flora 2020 (Gorteria 43)](https://natuurtijdschriften.nl/pub/1019223)
- [NDFF Verspreidingsatlas — Thelypteris palustris](https://www.verspreidingsatlas.nl/0427)
- [Wilde planten in Nederland en België — Moerasvaren](https://wilde-planten.nl/moerasvaren.htm)
- [NDFF Verspreidingsatlas — Mannetjesvaren](https://www.verspreidingsatlas.nl/0421)
- [RHS — Thelypteris palustris (marsh fern)](https://www.rhs.org.uk/plants/20658/thelypteris-palustris/details)
- [RHS — Shade gardening (definities zon en halfschaduw)](https://www.rhs.org.uk/advice/profile?pid=934)
- [Plants For A Future — Thelypteris palustris](https://pfaf.org/user/Plant.aspx?LatinName=Thelypteris+palustris)
- [Nederlandse Varenvereniging, Wat zijn varens](https://www.varenvereniging.nl/over-varens/wat-zijn-varens/)
- [De Vlinderstichting — Moerasvaren (waardplant)](https://vlinderstichting.nl/plants/moerasvaren/)
- [De Vlinderstichting — Varenspanner](https://www.vlinderstichting.nl/vlinders/overzicht-vlinders/details-vlinder/varenspanner)
- [De Vlinderstichting — Moeras-w-uil](https://vlinderstichting.nl/vlinder/moeras-w-uil/)
- [Heijnen Planten — Moerasvaren, 5-10 cm (prijs en planttijd)](https://www.heijnen-planten.nl/moerasvaren-thelypteris-palustris-5-10-pot-p9)
- [Cruydt-Hoeck — Moerasvaren (prijs)](https://www.cruydthoeck.nl/moerasvaren-thelypteris-palustris)
- [KwaliteitsPlanten — Thelypteris palustris (plantafstand)](https://www.kwaliteitsplanten.nl/thelypteris-palustris)
- [Vijverplantenland — Thelypteris palustris (plantdiepte)](https://www.vijverplantenland.nl/shop/thelypteris-palustris-moerasvaren/)
- [Wikimedia Commons — Leaf: photo by Sam Thomas (CC BY 2.0)](https://commons.wikimedia.org/wiki/File:Thelypteris_palustris,_Matley_Bog_%2852973805211%29.jpg)

## Read next

- [Royal fern: where it grows, planting and care](https://tuinontwerp.app/en/blog/royal-fern) - Royal fern (Osmunda regalis): a native fern 1 to 2.5 m tall in a garden, with rusty-brown spore plumes. Where it grows, what it costs and what can go wrong. (2026-09-27)
- [Woody nightshade: identify, plant and prune bittersweet](https://tuinontwerp.app/en/blog/woody-nightshade) - Woody nightshade (Solanum dulcamara): a native climber of 1.5 to 2.5 metres with purple flowers from June to September. Where it fits, planting and pruning. (2026-09-28)
- [Hart's tongue fern: planting and care of an evergreen fern](https://tuinontwerp.app/en/blog/harts-tongue-fern) - Hart's tongue fern (Asplenium scolopendrium): a native evergreen fern, 15 to 60 cm tall, for a shady spot. How to recognise it, plant it and rescue it. (2026-09-28)
- [More about ferns](https://tuinontwerp.app/en/blog/category/plants/varens)