How to Grow Hairy Cushion Plant
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Hairy Cushion Plant
Raoulia tenuicaulis
herbRaoulia tenuicaulis is a tiny, creeping alpine plant native to New Zealand that forms dense, cushion-like mats of silvery-green foliage. It produces minute white or pale yellow flowers and is prized by rock garden enthusiasts and alpine plant collectors for its architectural form and delicate appearance. This is an extremely slow-growing, long-lived alpine plant suitable for specialized growing conditions.
When should you plant Hairy Cushion Plant in your zone?
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Example Hairy Cushion Plant timeline · Pittsburgh, PA (Zone 6b)
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Plant Hairy Cushion Plant
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Hairy Cushion Plant
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in USDA zones 6-8; requires cool, well-drained conditions year-round
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Get my Hairy Cushion Plant timeline →Growth Stages
Establishment
1-3 yearsTiny seedling or rooted cutting with minimal visible growth; foliage appears silvery and fine-textured
Keep soil barely moist; ensure excellent drainage; protect from excessive moisture and humidity; avoid fertilizer; may take 1-2 years to visibly expand
Cushion Formation
2-5+ yearsSlowly expanding mat of tight, silvery-green foliage forming a low, dense pillow-like shape
Maintain strict drainage; water sparingly; ensure full sun for compact form; do not disturb roots; monitor for rot at base
Flowering
Spring to early summer (4-8 weeks)Minute white, cream, or pale yellow flowers appear above the silvery cushion, barely visible without close inspection
Flowers are inconspicuous but indicate plant maturity; maintain consistent dry conditions; do not deadhead unless necessary
Seed Set
Summer (6-8 weeks)Tiny fruits develop following flowering; seeds are extremely small and difficult to collect
Allow seeds to dry in place if you wish to collect them; seeds require cold stratification and are challenging to propagate
Dormancy
Fall and winter (4-6 months)Plant consolidates growth; foliage remains silvery and cushion-like but growth slows significantly
Reduce watering further; ensure excellent winter drainage; in wet climates, consider overhead protection or move to unheated alpine house
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Prevent through excellent drainage, reduced watering, and gritty soil amendments; no chemical cure; remove affected plants immediately
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Hand-pick; use copper tape barriers; avoid excess moisture that attracts them; diatomaceous earth may help
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Rare indoors; increase air circulation; spray with water if infestation occurs; insecticidal soap as last resort
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Remove with rubbing alcohol on a cotton swab; isolate affected plants; improve air circulation
Uses
Alpine Rock Garden Specimen
CraftRaoulia tenuicaulis is a prized specimen for specialist alpine troughs, rock gardens, and scree gardens, valued for its distinctive silver-green cushion form and architectural foliage. Its diminutive size and slow growth make it ideal for confined spaces. [source]
Ornamental Container Plant
HouseholdSuitable for alpine pots, sink gardens, and unheated alpine house cultivation where precise drainage control is possible. Often grown by alpine enthusiasts as a challenge plant. [source]
Pollinator Support
WildlifeThe minute flowers provide pollen and nectar for small insects including native bees and flies, supporting local pollinators in alpine and alpine garden settings. [source]
Botanical Curiosity and Collector Plant
CraftRaoulia tenuicaulis is highly sought by alpine plant collectors and botanists due to its rarity, unique growth form, and horticultural challenge. It represents a specialized niche in gardening. [source]
Harvest Tips
This plant is not harvested for culinary or medicinal use. Seeds may be collected from dried seed heads in late summer if you wish to propagate; viability is low and germination is extremely difficult, requiring cold stratification and special propagation conditions.
Fun Facts
- 🌱 Raoulia tenuicaulis is endemic to New Zealand's alpine regions and is sometimes called 'vegetable sheep' because entire hillsides covered with Raoulia species resemble flocks of sheep from a distance.
- 🌱 This plant is extremely slow-growing and long-lived; a mature specimen may only be a few inches across after a decade, but can live for many decades or centuries in ideal conditions.
- 🌱 The silvery-green color of its foliage is due to fine hairs covering the leaves, which help protect it from intense alpine UV radiation and reduce water loss in harsh mountain environments.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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