Does it need to be submerged?

It thrives in shallow water up to 15 cm deep or in consistently saturated soil.

How do I control its spread?

You can plant it in containers submerged in your pond to keep the rhizomes contained.

Plant guide

Common spike rush.

Eleocharis palustris

Pronounced el-ee-oh-KAIR-iss pal-US-triss

Also known as Common Spike-Rush, Common Spikerush, Creeping Spike-rush, Marsh Spike-rush, Small's spikerush

common spikerush — Photo by Katrin Simon (CC BY) via iNaturalist

This hardy perennial sedge thrives in wet, marshy environments. It is a fantastic choice for naturalizing pond edges or bog gardens. You will love how its slender, upright stems add a clean, architectural look to your water features.

At a glance

Care level: Easy
Plant type: Aquatic perennial
Light: Full sun to partial shade
Indoor light: Direct sun
Water: Every day
Mature size: 1 to 2 feet tall
Growth rate: Fast
Hardiness: USDA 3 to 10
Bloom time: Late spring to mid summer

Care

Keep the soil consistently saturated or submerged in shallow water to mimic its natural wetland home. Watch for yellowing stems, which often signal that the plant is drying out too much. It spreads via rhizomes, so keep an eye on it if you want to contain its growth.

Watering: Keep the soil constantly wet or submerged in up to 6 inches of water.
Feeding: Apply a slow release aquatic fertilizer during the active growing season.
Pruning: Trim back dead or brown stems in late winter or early spring to encourage fresh growth.
Repotting: Divide the root mass every couple of years if the container becomes overcrowded.
Soil: Heavy, wet, or boggy soil
Soil pH: 6.0 to 8.0
Temperature: -30 to 35°C
Humidity: 60 to 100%
Drought tolerance: Low
Lifespan: Perennial, typically 3 to 5 years.
Deer and rabbits: High

Signs it needs repotting

Roots growing out of the drainage holes.
The clump becomes too dense and stops producing new shoots.

Safety

People: There are no known toxic effects from handling or accidental ingestion of this plant.
Children: The stems are thin and can be sharp, so supervise young children playing near dense patches.
Edibility: This plant is not typically consumed by humans and lacks culinary value.

How to identify it

Slender, cylindrical, dark green stems
Small, brownish spikelets at stem tips
Grows in dense, upright clumps
Lacks prominent leaves on stems

Height: 0.2 to 0.8m
Spread: 0.3 to 1m
Leaves: green, deciduous
Flowers: brown, 0.5 to 1.5cm

Problems to watch for

Aphids · Small insects may cluster on the stems during hot, dry spells.

By symptom

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Growing it

Propagation: division, seed
When to plant: spring, summer
Overwintering: The foliage will die back in winter. Simply trim the dead brown stems to the water line once they turn yellow or brown in late autumn.
In containers: It grows well in pots submerged in water, provided the pot is at least 20 cm wide.

Division

1. Lift a clump from the mud in spring.
2. Gently pull the rhizomes apart into smaller sections.
3. Replant the sections immediately into wet soil or shallow water.

Group with other moisture loving plants to create a naturalistic bog garden effect.

Grows well with

Yellow Flag Iris · They share similar moisture requirements and provide structural contrast.
Cattail · Both thrive in the same wet, muddy conditions at the water edge.

Similar species

Needle Spike Rush · It is a much smaller, finer version of the common spike rush.

Science

Family: Cyperaceae
Genus: Eleocharis
Order: Poales
Class: Liliopsida
Native range: Widespread across the Northern Hemisphere.
Conservation: It is widespread and not of conservation concern.

It grows in dense colonies along shorelines, acting as a natural filter for water runoff.

Value to wildlife: nesting material for birds, cover for aquatic life
Pollinators: bees
Uses: erosion control, pond edge planting, wildlife habitat

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Light: 7/9
Temperature: 5/9
Moisture: 9/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need to be submerged?: It thrives in shallow water up to 15 cm deep or in consistently saturated soil.
How do I control its spread?: You can plant it in containers submerged in your pond to keep the rhizomes contained.

Where the name comes from

The name Eleocharis comes from the Greek words for marsh and grace, while palustris means of the marsh.

Good to know

It is commonly known as common spike rush.
The stems are actually photosynthetic, as the leaves are reduced to sheaths at the base.
It spreads efficiently through underground rhizomes.

Also in

Deer-resistant plants

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.