Species

Phlox subulataCreeping Phlox Moss Phlox

20 other cultivars

groundcoverN. America Native

Emerald Cushion Blue Moss Phlox

Phlox subulata 'Emerald Cushion Blue'

The Story

Plant Bio

Low-growing, mat-forming perennial with needle-like foliage.

Notable for its vivid blue flowers and ability to thrive in rocky or sandy soils.

Uses & Benefits:

Provides vibrant blue groundcover with dense, cushion-like foliage, ideal for borders and rock gardens.

Low-maintenance and drought-tolerant once established, reducing garden care effort.

Supports pollinators like bees and butterflies, enhancing garden biodiversity.

SpeciesPhlox subulataCreeping Phlox Moss Phlox

Essentials

At a Glance

Plant Type

Groundcover

Height

6 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Low to moderate

Humidity

Average

Lifespan

Perennial

Native To

Eastern North America

Toxicity

Non-toxic

Bloom period

Mid-spring

In flower about 1 month of the year

Planting

How to Grow

Tuck seeds lightly into well-drained soil in early spring.
Water regularly to keep soil moist but not soggy.
Mist cuttings with water to encourage root growth in spring.
Divide clumps in early spring or fall to propagate.
Apply a balanced fertilizer in spring and mid-summer.
Mulch around plants to conserve moisture and suppress weeds.

Pro Tip

Ensure excellent drainage to prevent root rot and promote healthy growth.

Keep It Thriving

Care Guide

Do

Water consistently during dry periods 🌱
Prune after flowering to maintain shape
Fertilize in early spring with a balanced fertilizer
Provide full sun for optimal blooming

Don't

Avoid overwatering to prevent root rot ❌
Don’t neglect pruning after flowering
Skip heavy fertilization late in the season
Do not plant in poorly drained soil

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vivid groundcover in rock gardensColorful border along pathwaysSilver-foliaged edging

Companion Plants

Sedum SempervivumLavender Coreopsis Gaillardia

Multiply

Propagation Methods

Good to Know

Common Questions

Emerald Cushion Blue Moss Phlox questions

What zones can Emerald Cushion Blue Moss Phlox grow in?

Emerald Cushion Blue Moss Phlox 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 Emerald Cushion Blue Moss Phlox deer resistant?

Yes — Emerald Cushion Blue Moss Phlox is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Emerald Cushion Blue Moss Phlox bloom?

Emerald Cushion Blue Moss Phlox typically blooms in mid-spring through mid-spring. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Emerald Cushion Blue Moss Phlox need full sun?

Emerald Cushion Blue Moss Phlox does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Emerald Cushion Blue Moss Phlox drought tolerant?

Yes — once established (usually after the first full season), Emerald Cushion Blue Moss Phlox handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.