Does it need full sun?

It prefers full sun but will tolerate partial shade if the soil stays wet.

Can I grow this in a standard garden bed?

Only if you have a very damp spot, as it requires constant moisture to thrive.

Plant guide

Common yellow sedge.

Carex demissa

Pronounced KAIR-eks de-MISS-ah

Also known as Common Yellow Sedge, Common Yellow-sedge

Common Yellow Sedge — Photo by John Barkla (CC BY) via iNaturalist

This charming sedge is a lovely choice for damp, boggy areas in your garden. It forms tidy, grassy tufts that look great near pond edges or in moist meadows. You will love how it brings a natural, wild feel to your landscape.

At a glance

Care level: Easy
Plant type: Perennial sedge
Light: Full sun to partial shade
Indoor light: Bright indirect
Water: Every 2 to 5 days
Mature size: 4 to 12 inches
Growth rate: Medium
Hardiness: USDA 4 to 9
Bloom time: Late spring to mid summer

Care

Keep the soil consistently moist, as this plant thrives in wet conditions. Watch for browning leaf tips, which often signal that the soil has dried out too much. It is a very low maintenance plant that rarely needs extra attention once established.

Watering: Keep the soil constantly damp to mimic its natural wetland habitat.
Feeding: Apply a balanced, slow release fertilizer once during the spring.
Pruning: Trim back dead foliage in late winter to make room for fresh spring growth.
Repotting: Divide the clumps every few years to keep the plant vigorous and healthy.
Soil: Moist, acidic, boggy soil
Soil pH: Acidic
Temperature: -34 to 25°C
Humidity: 60 to 90%
Drought tolerance: Low
Lifespan: Perennial, typically 3 to 5 years.
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of the drainage holes
Water sitting on the surface for too long

Safety

People: There are no known toxic properties for humans.
Children: The sharp leaf edges can cause minor paper cuts if handled roughly by children.
Edibility: This plant is not considered edible for humans.

How to identify it

Bright green, narrow grass like leaves
Forms dense, compact clumps
Yellowish green flower spikes
Small, triangular seed capsules

Height: 0.1 to 0.3m
Spread: 0.15 to 0.3m
Leaves: bright green, yellow green, evergreen
Flowers: brown, green, 0.5 to 1.5cm
Fruit: brown, Late summer

Problems to watch for

Rust · Fungal spots may appear on foliage in stagnant, humid conditions.

By symptom

Plant problems by symptom

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Growing it

Propagation: division, seed
When to plant: spring, autumn
Overwintering: This plant is fully hardy and requires no special protection. Simply leave the foliage intact until spring to protect the crown.
In containers: It grows well in containers if kept in a tray of water to ensure the soil never dries out.

Division

1. Dig up a mature clump in spring.
2. Gently pull the root mass apart into smaller sections.
3. Replant immediately in wet soil.

Group this sedge with other moisture-loving perennials to create a naturalistic bog garden effect.

Grows well with

Marsh Marigold · They both love the same wet, boggy soil conditions.
Ragged Robin · This companion adds a nice contrast in texture and color to the sedge.

Similar species

Yellow Sedge · It looks very similar but is typically larger and more robust.

Science

Family: Cyperaceae
Genus: Carex
Order: Poales
Class: Liliopsida
Native range: Northern and Western Europe, parts of North America.
Conservation: It is widespread and common throughout its range, so it is not of conservation concern.

It colonizes wet, open habitats by producing abundant seeds that travel easily through water and mud.

Value to wildlife: larval host plant, nesting material
Pollinators: bees, butterflies
Uses: bog gardens, wet meadow restoration, ground cover

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 3/9
Light: 7/9
Temperature: 3/9
Moisture: 8/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Does it need full sun?: It prefers full sun but will tolerate partial shade if the soil stays wet.
Can I grow this in a standard garden bed?: Only if you have a very damp spot, as it requires constant moisture to thrive.

Where the name comes from

Carex is the ancient Latin name for sedges, while demissa means low or humble, referring to its compact growth habit.

Good to know

It is often called the common yellow sedge.
It thrives in acidic, boggy soils where many other plants struggle.
The seed heads are quite distinct and look like tiny, prickly stars.

Keep your common yellow sedge growing

This page is a general guide. Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked.

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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.