Species

Carex siderostictaSiderosticta sedge

5 other cultivars

groundcover

Treasure Island Sedge

Carex siderosticta 'Treasure Island'

Same species

Species

Carex siderostictaSiderosticta sedge

5 other cultivars

Essentials

At a Glance

Plant Type

Groundcover

Height

8 inches

Width

15 inches

Light

Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Moist

Humidity

Moderate to high

Lifespan

Perennial

Native To

Asia

Toxicity

Non-toxic

The Story

Plant Bio

A deciduous, perennial sedge that forms a slowly spreading clump of broad, bamboo-like leaves. The foliage is green with prominent creamy-white to pale yellow margins. This cultivar is valued for its striking variegation and compact growth, making it an excellent choice for low-maintenance borders and container planting.

Bloom Period:

EarlyLate

Uses & Benefits:

Adds texture and greenery to shaded garden areas, especially in moist soils.

Erosion control on damp slopes and water edges.

Provides habitat for small wildlife and insects.

Planting

How to Grow

Tuck sedge seeds into moist soil in early spring.
Mist cuttings with water weekly for root development.
Ensure soil remains consistently moist during growing season.
Transplant young plants during early spring or fall.
Mulch around plants to retain moisture and suppress weeds.
Divide clumps every 3–4 years to maintain vigor.

Pro Tip

Prefers consistently moist, well-drained soil and partial shade for best results.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist 🌱
Mulch to conserve moisture and suppress weeds
Divide every few years to rejuvenate

Don't

Avoid dry or overly compacted soil ❌
Do not expose to full sun in hot climates
Avoid over-fertilizing which can promote disease

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Mulch
Plant
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Moist, shaded borderNative plant gardenWater's edge plant

Companion Plants

Ferns Hostas Astilbes Japanese forest grass Ligularia

Multiply

Propagation Methods

Good to Know

Common Questions

Treasure Island Sedge questions

What zones can Treasure Island Sedge grow in?

Treasure Island Sedge is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Treasure Island Sedge deer resistant?

Not reliably. Deer may browse Treasure Island Sedge, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Treasure Island Sedge bloom?

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

Does Treasure Island Sedge need full sun?

Treasure Island Sedge does best in part shade.