cactus succulent

Ciliated Houseleek

The Story

Plant Bio

Sempervivum ciliosum is a mat-forming evergreen succulent native to the mountain ranges of Southeastern Europe, where it colonizes rocky crevices. It produces tight, globose rosettes of fleshy leaves that multiply via offsets on short stolons to form dense, ground-hugging colonies.

This species is distinguished by the dense fringe of fine, greyish-white hair-like cilia along its leaf margins, giving the teal-to-lime-green rosettes a distinctly fuzzy, silvery appearance. In summer, mature rosettes produce upright flowering spikes topped with clusters of star-shaped, pale yellow flowers before dying.

Uses & Benefits:

Provides year-round architectural interest with its geometric, silver-fringed rosettes and summer yellow flowers.

Functions as an exceptionally low-maintenance, drought-tolerant groundcover for dry, rocky soils where other plants fail.

Attracts native bees and small beneficial insects to its star-shaped summer blooms.

Essentials

At a Glance

Plant Type

Cactus Succulent

Height

Width

20"

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Low

Humidity

Low

Lifespan

Perennial

Native To

Southeastern Europe

Toxicity

Non-toxic

Bloom period

Summer

In flower about 3 months of the year

Planting

How to Grow

Select a planting site in full sun with exceptionally sharp drainage, such as a rock garden, gravel scree, or unglazed terracotta container.
Use a lean, gritty mineral substrate, heavily amending standard potting soil with coarse sand, perlite, or fine gravel.
Plant the rosettes shallowly, ensuring the base of the foliage sits just above the soil line to prevent moisture retention against the crown.
Water sparingly during the active spring and summer growing seasons, allowing the soil to dry out completely between waterings, and withhold water almost entirely during winter dormancy.

Pro Tip

Unlike tougher garden houseleeks, this species is highly sensitive to winter wet; plant it in sharply draining mineral grit or under architectural cover to prevent the fuzzy rosettes from rotting during cold, rainy seasons.

Keep It Thriving

Care Guide

Do

Provide maximum direct sunlight to maintain the tight, compact shape of the rosettes.
Gently pluck away withered lower leaves by hand to maintain air circulation around the crown.
Protect the plants from heavy, persistent winter rains by placing them under eaves or in cold frames.

Don't

Never allow the plant to sit in standing water or heavy, moisture-retaining clay soils.
Do not fertilize heavily, as excess nitrogen causes weak, bloated growth and loss of rosette form.
Avoid overhead watering during humid weather to prevent moisture from trapping in the hairy leaf margins.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Deadhead
Fertilize
Propagate
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Rock gardensCrevice gardensTroughs and containersGravel pathways

Companion Plants

Sedum album Saxifraga paniculata

Multiply

Propagation Methods

Good to Know

Common Questions

Ciliated Houseleek questions

What zones can Ciliated Houseleek grow in?

Ciliated Houseleek 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 Ciliated Houseleek deer resistant?

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

When does Ciliated Houseleek bloom?

Ciliated Houseleek typically blooms in summer through summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Ciliated Houseleek need full sun?

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

Is Ciliated Houseleek drought tolerant?

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