Species

Phlox subulataCreeping Phlox Moss Phlox

20 other cultivars

groundcoverN. America Native

Moss Phlox Blue Hills

Phlox subulata 'Blue Hills'

The Story

Plant Bio

Phlox subulata, commonly known as moss phlox or creeping phlox, is a low-growing perennial with dense mats of needle-like foliage and vibrant, star-shaped flowers in various shades of blue, forming a stunning ground cover.

The 'Blue Hills' cultivar is distinguished by its particularly vivid blue flowers and its compact, spreading habit, making it ideal for rock gardens and border edging.

Uses & Benefits:

Creates vibrant, low-maintenance groundcover with bright spring flowers.

Suppresses weeds and prevents soil erosion.

Provides nectar for pollinators and habitat for beneficial insects.

SpeciesPhlox subulataCreeping Phlox Moss Phlox

Essentials

At a Glance

Plant Type

Groundcover

Height

3 inches

Width

12 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

Bloom period

Mid-spring – Late spring

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds into well-draining soil in early spring.
Water gently until established, about 2 weeks.
Place in full sun for best flowering.
Fertilize lightly in early spring with balanced fertilizer.
Thin out crowded plants to promote air circulation.
Mulch around plants to retain moisture and suppress weeds.

Pro Tip

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

Keep It Thriving

Care Guide

Do

Water during dry spells 🌱
Prune after flowering to maintain shape
Mulch to conserve moisture

Don't

Overwater to avoid root rot ❌
Avoid heavy fertilization in late summer
Don’t forget to weed regularly

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Silver-foliaged groundcoverBorder edging with bright flowers

Companion Plants

Sedum CoreopsisLavender Yarrow Echinacea

Multiply

Propagation Methods

Good to Know

Common Questions

Moss Phlox Blue Hills questions

What zones can Moss Phlox Blue Hills grow in?

Moss Phlox Blue Hills 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 Moss Phlox Blue Hills deer resistant?

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

When does Moss Phlox Blue Hills bloom?

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

Does Moss Phlox Blue Hills need full sun?

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