How to Grow Woolly Raoulia
iNaturalist
Woolly Raoulia
Raoulia australis
flowerRaoulia australis is a tiny, slow-growing evergreen cushion plant native to New Zealand that forms dense, woolly mats rarely exceeding 1 inch in height. It produces minute cream to yellow flowers in summer and is prized by alpine gardeners and rock garden enthusiasts for its distinctive silvery-grey foliage and carpet-like growth habit.
When should you plant Woolly Raoulia in your zone?
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Example Woolly Raoulia timeline · Pittsburgh, PA (Zone 6b)
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Plant Woolly Raoulia
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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First Woolly Raoulia blooms
Around Oct 14≈ 180 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Woolly Raoulia dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 6-9, preferring cooler climates with excellent drainage
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Get my Woolly Raoulia timeline →Growth Stages
Germination
2-4 weeksTiny seedlings emerge from seed with minimal visible growth; extremely slow to develop first true leaves
Keep soil barely moist but never wet; provide bright light; avoid damping off by ensuring air circulation; germination can take 2-4 weeks
Establishment
6-12 monthsSeedling grows very slowly, forming tiny rosettes and beginning to develop the characteristic woolly texture on leaves
Water minimally; do not fertilize; ensure excellent drainage; protect from excessive moisture; this stage is lengthy and patience is essential
Cushion Formation
Ongoing (years)Plant forms dense, low mats of silvery-grey woolly foliage, gradually expanding outward in a slow, carpet-like growth pattern
Water only during extended drought; avoid overhead watering; do not apply fertilizer; allow plant to spread naturally without disturbance
Flowering
6-8 weeksIn summer (June-August in Northern Hemisphere), tiny inconspicuous cream or pale yellow flowers appear scattered across the mat surface
Flowers are very small and easily missed; maintain dry conditions; do not deadhead as flowers are minimal and self-cleaning
Maturity
IndefiniteEstablished plant maintains its cushion form indefinitely, potentially reaching 12-24 inches in diameter after many years of growth
Rarely requires pruning or maintenance; extremely long-lived; only water during severe drought; protect from excessive winter moisture
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Ensure excellent drainage; water minimally; use gritty, well-draining potting mix; improve air circulation; replant in new soil if affected
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Spray with water to increase humidity; rarely problematic in outdoor alpine conditions; use insecticidal soap if severe
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and
Hand-pick; apply copper tape around containers; use slug bait sparingly; ensure good drainage to reduce slug habitat
Uses
Alpine and Rock Garden Specimen
CraftRaoulia australis is a premier choice for alpine troughs, scree gardens, rock gardens, and specialized alpine displays where its unique silvery cushion form provides year-round visual interest and texture. [source]
Container and Pot Gardening
CraftWell-suited to shallow alpine pots, terracotta bowls, and decorative containers where its slow, compact growth and low water needs make it ideal for collectors and specialist growers. [source]
Pollinator Support
WildlifeThe delicate summer flowers, though small, attract minor pollinator activity and provide a food source for small insects in alpine ecosystems. [source]
Ornamental Foliage Interest
HouseholdThe silvery-grey woolly foliage provides striking textural contrast and year-round color in alpine gardens, displaying grey tones that complement other rock garden plants. [source]
Harvest Tips
Raoulia australis is not harvested for use; it is grown as an ornamental plant. Seeds can be collected in late summer after flowering, then dried and stored for propagation.
Fun Facts
- 🌱 Raoulia australis is endemic to New Zealand and is one of the tiniest flowering plants in cultivation, rarely exceeding 1 inch in height, making it a prized specimen for alpine plant collectors worldwide.
- 🌱 The woolly texture of its leaves is an adaptation to alpine conditions, helping the plant retain moisture and protect itself from intense UV radiation and wind exposure on high mountain slopes.
- 🌱 This plant can live for decades or even longer if provided with perfect drainage and minimal disturbance, making it a long-term investment for patient gardeners—some specimens are known to be 20+ years old.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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