Species

Carex siderostictaSiderosticta sedge

6 other cultivars

grass

Snow Cap Sedge

Carex siderosticta 'Snow Cap'

The Story

Plant Bio

Carex siderosticta is a deciduous, rhizomatous perennial sedge native to woodland mountain areas of East Asia. The species spreads slowly via underground rhizomes to form a dense, creeping groundcover of broad, arching, hosta-like foliage.

'Snow Cap' features broad, strap-like leaves that emerge nearly entirely snow-white or cream with a very narrow, dark green margin. In cold northern spring climates, the emerging foliage occasionally displays soft pink tones before maturing.

Uses & Benefits:

Striking white and cream variegated foliage that brightens deep shade gardens.

Tolerates wet soils and rain gardens better than many standard ornamental grasses.

Provides low-level ground cover and habitat for small woodland wildlife.

SpeciesCarex siderostictaSiderosticta sedge

Essentials

At a Glance

Plant Type

Grass

Height

Width

15"

Light

Partial Sun, Shade

Zones

5, 6, 7, 8, 9

Water

Medium to wet

Humidity

High

Lifespan

Perennial

Native To

East Asia

Toxicity

Non-toxic

Bloom period

Late spring – Early summer

In flower about 2 months of the year

Planting

How to Grow

Select a planting site in partial to full shade with moist, humus-rich, acidic to neutral soil.
Dig a hole twice the width of the root ball and set the plant so the crown sits level with the surrounding soil.
Water thoroughly after planting and apply a layer of organic mulch to retain soil moisture.
Maintain consistent moisture, especially during dry summer periods, until the root system is fully established.

Pro Tip

Shear the entire clump to the ground in late winter or early spring before new shoots emerge to ensure clean, bright foliage for the coming season.

Keep It Thriving

Care Guide

Do

Keep the soil consistently moist, especially during hot, dry summer spells.
Apply a light layer of organic mulch annually to help retain moisture and mimic a woodland floor.
Cut back dead foliage completely to the ground in late winter before new growth starts.

Don't

Do not plant in full, hot afternoon sun, which will scorch the white variegated foliage.
Do not allow the soil to dry out completely, as this cultivar has low drought tolerance.
Avoid over-fertilizing, as excessive nutrients can degrade the variegation and weaken the growth habit.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Fertilize
Pest Check
Prune
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Shade Garden BorderRain GardenWoodland Understory GroundcoverMass Planting

Companion Plants

Hosta

Multiply

Propagation Methods

Good to Know

Common Questions

Snow Cap Sedge questions

What zones can Snow Cap Sedge grow in?

Snow Cap Sedge is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Snow Cap Sedge deer resistant?

Yes — Snow Cap Sedge is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Snow Cap Sedge bloom?

Snow Cap Sedge typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Snow Cap Sedge need full sun?

Snow Cap Sedge does best in part shade.