groundcover

Rock Spikemoss

Selaginella rupestris 'Bald Knob'

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Groundcover

Height

6 inches

Width

12 inches

Light

Partial Sun, Shade

Zones

4, 5, 6, 7, 8, 9

Water

Low

Humidity

Low to average

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

The Story

Plant Bio

Selaginella rupestris, commonly known as Bald Knob, is a low-growing, evergreen fern ally with delicate, moss-like foliage that forms dense mats, often exhibiting a vibrant green hue. This cultivar is distinguished by its exceptional drought tolerance and ability to thrive in rocky or well-drained soils, making it ideal for ground cover in challenging environments.

Uses & Benefits:

Provides lush, evergreen groundcover in shaded gardens, adding texture and greenery year-round.

Helps retain soil moisture and prevent erosion on slopes or shaded areas.

Supports local insects and maintains soil health in woodland gardens.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

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Planting

How to Grow

Tuck spores or small plants into soil in spring.
Mist cuttings regularly to maintain humidity.
Ensure soil remains moist but well-drained.
Provide partial shade for optimal growth.
Protect from frost during winter.

Pro Tip

Keep soil moist and avoid direct harsh sunlight for best results.

Keep It Thriving

Care Guide

Do

Water regularly to keep soil moist 🌱
Apply mulch to retain moisture
Provide shade during hottest months

Don't

Overwater to prevent root rot ❌
Expose to full sun in hot climates ❌
Allow soil to dry out completely ❌

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Shaded groundcoverMoist woodland border

Companion Plants

Ferns Hostas Heuchera

Multiply

Propagation Methods

Good to Know

Common Questions

Rock Spikemoss questions

What zones can Rock Spikemoss grow in?

Rock Spikemoss 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 Rock Spikemoss deer resistant?

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

Does Rock Spikemoss need full sun?

Rock Spikemoss does best in part shade.

Is Rock Spikemoss drought tolerant?

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