How to Grow Androsace (Rock Jasmine)

Wikimedia Commons

Androsace (Rock Jasmine)

Androsace spp.

flower

Androsace is a diverse genus of small, alpine and rock garden plants in the Primulaceae family, prized for their delicate rosette forms and delightful star-shaped flowers. These hardy perennials and annuals range from tiny cushion-forming varieties to low-growing mats, making them ideal for alpine troughs, rock gardens, and carefully managed containers. Most species are cold-hardy and thrive in well-draining, gritty soils with excellent water management.

Looking for a specific variety?

Androsace alpina Androsace carnea Androsace lanuginosa Androsace sarmentosa Androsace sempervivoides Androsace villosa

When should you plant Androsace (Rock Jasmine) in your zone?

Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.

Get my Androsace (Rock Jasmine) timeline →

Example Androsace (Rock Jasmine) timeline · Pittsburgh, PA (Zone 6b)

Plant Androsace (Rock Jasmine)
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
First Androsace (Rock Jasmine) blooms
Mid-to-late summer

Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Androsace (Rock Jasmine) dates for your own zip code.

Growing Conditions

☀️

Sun: Full sun, 6+ hours daily. Some afternoon shade beneficial in hot climates (zones 7-8)

💧

Water: Moderate to minimal. Water regularly during growing season but allow soil to dry between waterings. Extremely sensitive to waterlogging; excellent drainage is critical. Reduce watering in winter dormancy. Some species prefer drier conditions year-round

📏

Spacing: 4-8 inches depending on species size at maturity inches

📅

Days to maturity: Highly variable by species; most reach flowering maturity in 2-3 years from seed

🌱

Planting depth: Surface sow seeds (light-dependent germination). Plant young rosettes at soil level, keeping crown just above soil

Soil

Type: Very well-draining, gritty, sandy loam with alpine character. Must prevent winter waterlogging

pH: 6.5-7.5

Amendments:

Coarse sand or grit (30-40% by volume) Perlite or pumice Leaf mold or fine compost (minimal, 10-15%) Small gravel for surface dressing

Growing Zones

Find your zone →

Zones 3-7 for most species; varies by cultivar. Alpine species thrive in cooler zones; some Mediterranean species prefer zones 7-8

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a

Get my Androsace (Rock Jasmine) timeline →

Growth Stages

Seed/Germination

3-8 weeks

Tiny seeds need light exposure and cool stratification. Seedlings are minute and fragile

Sow on gritty seed compost surface. Stratify 4-6 weeks at 40°F. Keep moist but not wet. Germination slow and erratic, may take 3-4 weeks

Seedling/Early Rosette

2-4 months

Miniature rosettes form, 0.5-1 inch diameter. Very vulnerable to damping-off and overwatering

Maintain excellent drainage. Avoid wetting foliage. Ensure good air circulation. Pot on when 2-3 true leaves visible. Use gritty potting mix

Vegetative/Rosette Development

6-12 months

Rosettes expand slowly, 1-3 inches diameter depending on species. Foliage develops characteristic colors and textures

Minimal fertilizer (light feeding only). Maintain strict drainage. Full sun exposure develops compact form and color. Monitor for root rot and pests. Harden off before planting outdoors

Flowering

4-8 weeks (spring to early summer)

Delicate flower stems rise above rosette bearing tiny star-shaped flowers, usually pink, white, or yellow. Blooms are 0.25-0.5 inch diameter

Provide full sun. Do not overwater despite wet foliage needs during bloom. Support flower stems with small stakes if needed. Deadhead spent flowers to encourage extended bloom

Post-Bloom/Dormancy

Seasonal (summer-winter)

Flowers fade, seeds develop. Plant enters summer rest or dormancy depending on species type and climate

Reduce watering gradually. Allow soil to dry more. Some species go completely dormant; others slow growth. Collect seed if desired before full ripening. Minimal water through winter dormancy

Companion Planting

Plan your garden →

Plant with:

Saxifrage Sempervivum Pulsatilla Aquilegia alpina Dianthus alpinus Draba Armeria Silene schafta Alpine phlox Campanula cochleariifolia

Avoid planting near:

Vigorous aggressive spreaders (normal herbaceous perennials may overwhelm tiny Androsace) Rhododendrons (prefer different soil pH and drainage) Plants requiring constant moisture (hostas, astilbe) Tall shade-producing plants

Common Pests

Spray with water to dislodge. Use neem oil or insecticidal soap if severe. Avoid systemic pesticides on alpine plants
Increase air circulation and humidity by careful misting. Neem oil. Red spider mite-prone in hot, dry conditions
and
Copper tape around pots. Grit mulch deterrent. Hand-pick at night. Avoid metaldehyde; use iron phosphate if needed
and (waterlogging-related)
Prevention is key: ensure exceptional drainage, never overwater. Remove affected plants immediately. Improve air circulation
Increase air circulation. Reduce overhead watering. Sulfur dust if needed; avoid on very hot days
Hand-pick visible insects. Remove debris where they hide. Diatomaceous earth around plants

Uses

🎨

Alpine rock garden specimen

Craft

Androsace species are prized collector plants for alpine troughs, scree gardens, rock gardens, and alpine sinks. Their diminutive size and delicate blooms provide year-round structural interest and spring-summer color. [source]

🎨

Container and trough gardening

Craft

Perfect for raised alpine troughs, hypertufa containers, and specialized pots where drainage and soil control are paramount. Allows gardeners in unsuitable climates to grow these challenging plants [source]

🦋

Pollinator support

Wildlife

The small star-shaped flowers attract early-season bees, solitary bees, and hoverflies. Provides nectar and pollen when other spring forage is scarce [source]

🏠

Groundcover and edging

Household

Some vigorous spreading species (A. carnea, A. sempervivoides) form mats suitable as decorative edging in rock gardens or alpine lawns, adding texture and structure [source]

💊

Traditional herbal use

Medicinal

Several Androsace species have been used in traditional Alpine and Asian folk medicine, though scientific evidence is limited. Modern use is primarily ornamental [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Androsace is grown for ornament, not harvest. Collect seed when seed capsules dry and turn brown (late spring/early summer). Dry fully on paper, store cool and dry. Seeds remain viable 1-2 years. Propagate from seed or divisions of mature rosettes in spring or autumn

Fun Facts

🌱 Androsace is derived from Greek 'andros' (man) and 'sake' (defense), possibly referring to the flower's umbel structure resembling a shield or protective armor
🌱 Some Androsace species are among the most extreme alpine plants, growing at elevations above 13,000 feet in the Himalayas and are adapted to survive intense UV exposure and extreme temperature fluctuations
🌱 Androsace sarmentosa is sometimes called 'mother-of-thousands' due to its creeping stolons that produce abundant plantlets, making it a vigorous grower compared to other species

Gardening Terms

New to gardening? Learn about terms used in this guide:

Annual Compost Deadhead Full Sun Germination Perennial True Leaves

Shop Androsace (Rock Jasmine) plants and related plants at Plant Addicts →

Join 30,000 gardeners planning their gardens with LizPlants.

Get your personalized Androsace (Rock Jasmine) planting timeline

Tell us your zip code and we'll calculate exactly when to start Androsace (Rock Jasmine) seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.

Get my Androsace (Rock Jasmine) timeline →