groundcover

Swamp Musk

Mazus radicans

The Story

Plant Bio

Mazus radicans is a low-growing, perennial groundcover with slender, creeping stems and small, lance-shaped leaves. It produces tiny, tubular flowers that are usually purple or blue, creating a dense floral carpet.

Valued for its vigorous, mat-forming habit and ability to thrive in moist areas. Its small, often bronze-tinged leaves contrast with the intricate white and purple flowers.

Uses & Benefits:

Provides vibrant purple ground cover that brightens shady spots and rock gardens.

Low-maintenance, drought-tolerant once established, and helps prevent soil erosion.

Attracts beneficial insects and supports garden biodiversity.

Essentials

At a Glance

Plant Type

Groundcover

Height

2 inches

Width

12 inches

Light

Full Sun, Partial Sun

Zones

5, 6, 7, 8

Water

Consistently moist to wet

Humidity

Prefers moderate humidity

Lifespan

Perennial

Native To

New Zealand

Toxicity

Non-toxic to humans and pets

Bloom period

Late spring – Early summer

In flower about 2 months of the year

Planting

How to Grow

Tuck seeds into well-drained soil in early spring
Water gently to keep soil moist during germination
Place in partial shade for best growth
Allow plants to establish for 6 weeks before watering deeply
Mulch lightly to conserve moisture and suppress weeds
Prune lightly after flowering to maintain shape

Pro Tip

Ensure well-drained soil and avoid overwatering for best results

Keep It Thriving

Care Guide

Do

Water regularly during dry spells 🌱
Prune lightly after flowering to promote bushiness
Mulch to retain moisture and regulate soil temperature

Don't

Avoid overwatering which can cause root rot ❌
Don’t let soil become waterlogged
Refrain from heavy fertilization; too much can reduce flowering

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Pest Check
Plant

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vivid purple groundcover in rock gardensBorder edging with fragrant flowersShaded slopes with lush foliage

Companion Plants

Hostas Ferns Coral Bells Lamb's Ear Heuchera

Multiply

Propagation Methods

Good to Know

Common Questions

Swamp Musk questions

What zones can Swamp Musk grow in?

Swamp Musk is hardy in USDA Zones 5–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Swamp Musk deer resistant?

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

When does Swamp Musk bloom?

Swamp Musk 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 Swamp Musk need full sun?

Swamp Musk does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.