Overview
Poa vivipara (sometimes treated as P. alpina subsp. vivipara) is a small, tufted perennial grass in the Poaceae family, growing 4–12 inches (10–30 cm) tall in dense clumps 3–6 inches (8–15 cm) wide. It is characterised by vivipary — the spikelets develop directly into small plantlets (bulbils) on the panicle instead of producing normal flowers and seeds. Each plantlet consists of a miniature grass tiller 0.3–0.5 inch (8–12 mm) long with 1–3 tiny green leaves, which detaches from the panicle and roots upon contact with moist ground. The panicle appears as a compact cluster of green plantlets rather than the typical open grass inflorescence — giving the plant a distinctive shaggy or tufted appearance at the stem tip. This vegetative reproduction strategy is an adaptation to short alpine and arctic growing seasons, where the time available for seed maturation is insufficient. Leaves are flat, 1–2 mm wide, bright green, smooth, with a blunt, boat-shaped tip (cucullate) characteristic of Poa. The species occurs in arctic, subarctic, and alpine habitats across the northern hemisphere, growing on rocky ground, scree, cliff ledges, and short turf at elevations up to 13,000 feet (4,000 m) in the European Alps. Tolerates extreme cold, wind, thin soil, and UV exposure. Growth rate is slow — individual tufts expand 0.5–1 inch (1–2.5 cm) per year.
Native Range
Poa vivipara is circumpolar in distribution, native across arctic and alpine regions of Europe, Asia, and North America — including Scandinavia, Iceland, Greenland, the Scottish Highlands, the Alps, the Himalayas, the Rocky Mountains, and arctic Canada and Alaska. It occurs on rocky ground, scree, cliff ledges, and short alpine turf from near sea level in the arctic to approximately 13,000 feet (4,000 m) in mountain ranges.Suggested Uses
Grown in alpine troughs, crevice gardens, and rock gardens as a specialist alpine plant. The viviparous reproduction is a botanical curiosity and educational feature. Effective planted into tufa rock and in shallow, gritty substrates. Combines with other alpine plants such as Saxifraga, Draba, and Silene acaulis. Not suited to standard garden borders.How to Identify
Appearance
Size & Dimensions
Height4" - 1'
Width/Spread3" - 6"
Reaches mature size in approximately 3 years
Bloom Information
Viviparous panicles develop from June through August in alpine and arctic habitats. There is no true flowering — spikelets are replaced by vegetative plantlets. Plantlets mature over 4–6 weeks, turning from green to purple-tinged before detaching. In lowland cultivation, panicles appear in May–June.Detailed Descriptions
Flower Description
Green (viviparous plantlets, not true flowers)Foliage Description
Bright greenGrowing Conditions
Sun Requirements
Requires 6-12 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Plant in full sun in sharply drained, lean, acidic to neutral soil with a pH of 4.5–7.0. Space 4–6 inches (10–15 cm) apart. Use a gritty, mineral-rich planting mix — 60–70% coarse grit/pumice and 30–40% loam. Do not fertilise. Water moderately during the growing season; tolerates brief drought but not extended dry periods in lowland gardens. The species is adapted to cool temperatures — it may struggle in hot summer conditions above 80°F (27°C). In the Pacific Northwest, grow in an alpine trough, rock garden, or crevice garden where cool conditions and sharp drainage can be maintained.Pruning
No pruning required. Remove dead foliage in early spring. The compact tuft is self-maintaining.Maintenance Level
very lowContainer Growing
✓ Suitable for container growing
Minimum container size: 1 gallons