How to Grow Mountain Bluegrass
Mountain Bluegrass
Poa subalpina
grassMountain bluegrass is a cool-season perennial grass native to high-elevation meadows and alpine regions of western North America. It forms dense, attractive tufts with fine-textured blue-green foliage and is highly valued for erosion control, restoration of alpine and subalpine areas, and ornamental landscaping in mountainous regions. This hardy grass tolerates extreme cold, poor soils, and steep slopes better than most lawn grasses.
When should you plant Mountain Bluegrass in your zone?
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Example Mountain Bluegrass timeline · Pittsburgh, PA (Zone 6b)
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Plant Mountain Bluegrass
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 Mountain Bluegrass
Around Jul 16≈ 90 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Mountain Bluegrass dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-7, with optimal performance in zones 3-6 at higher elevations
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Germination
1-2 weeksFine seed germinates in 7-14 days under cool, moist conditions; tiny seedlings emerge with narrow cotyledons
Keep seed bed consistently moist but not waterlogged; cold stratification (30-60 days) improves germination rates; sow in fall or early spring for best results
Seedling & Establishment
4-8 weeksYoung plants develop fine, blue-green leaf blades in compact tufts; root system deepens and spreads
Maintain moderate moisture; avoid heavy foot traffic; thin seedlings to proper spacing if direct seeding; protect from excessive heat and drying winds
Vegetative Growth
2-4 monthsDense tufts expand with increasing fine foliage; deep root system establishes in first growing season; blue-green color becomes more pronounced
Water during dry spells; minimal fertilizer needed (avoid excess nitrogen); allow natural growth pattern; mow infrequently if in landscape setting
Flowering & Seed Production
2-3 months (June-August depending on elevation)Delicate, open panicle inflorescences emerge on slender culms in early to mid-summer; flowers are inconspicuous but attractive; seeds mature in late summer
Allow flowering for seed production and natural landscape beauty; do not mow during this period; collect seed if desired (viable for 2-3 years)
Dormancy & Winter
3-4 monthsFoliage turns golden-brown or reddish in fall; enters dormancy; remains evergreen in mild winters but may appear dormant
No active care needed; excellent cold hardiness to -40°F or lower; provides winter cover and erosion control; emerges green in spring
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Rare in mountain bluegrass; ensure proper drainage and air circulation; remove dead thatch
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Uncommon at high elevations; maintain plant vigor; irrigate during drought stress
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Spray with water to dislodge; encourage natural predators; rarely damaging
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Improve air circulation; avoid excess nitrogen; fungicide rarely needed
Uses
Alpine Habitat Restoration
WildlifeMountain bluegrass is a keystone native species for revegetating alpine meadows, ski slopes, and disturbed high-elevation areas. Its deep root system prevents erosion on steep slopes and helps stabilize fragile alpine soils while providing food and cover for alpine wildlife. [source]
Erosion Control & Slope Stabilization
HouseholdThe dense root system and fine texture make mountain bluegrass ideal for stabilizing mountain slopes, roadsides, and construction areas in cold climates. It thrives where conventional turf grasses fail, particularly in rocky, poor soils above 8,000 feet elevation. [source]
Nutritious Forage for Livestock
CulinaryMountain bluegrass is a valuable cool-season forage grass that livestock readily graze. Its high palatability and nutritional content make it important for summer range management in mountainous regions. [source]
Ornamental Landscape & Meadow Gardens
CraftThe fine blue-green foliage and delicate seed heads create beautiful naturalistic plantings in alpine and subalpine gardens. It's prized for meadow restorations and mountain-themed ornamental landscapes. [source]
Traditional Alpine Herbal Use
MedicinalMountain bluegrass has been used traditionally in alpine folk medicine as a nutritive and cleansing herb. Dried forage contains minerals and vitamins valued in herbal preparations. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Mountain bluegrass is grown for soil stabilization, erosion control, and ornament rather than harvest. Seed can be collected in late summer (July-September) by hand-stripping mature panicles when they turn brown; winnow and dry thoroughly before storage. For forage/livestock use, graze or cut after flowering but before seed drop to prevent seed dispersal. Do not harvest in first year; allow full establishment.
Fun Facts
- 🌱 Mountain bluegrass grows above 8,000 feet elevation in its native habitat and can tolerate temperatures that drop to -40°F or below, making it one of North America's hardiest grass species.
- 🌱 The fine, blue-green color of the foliage inspired the name 'bluegrass,' though true bluegrass refers to Poa pratensis; mountain bluegrass is equally beautiful with a more delicate, alpine aesthetic.
- 🌱 Mountain bluegrass seeds are viable for 2-3 years and can germinate under snow, giving them a competitive advantage in alpine environments with short growing seasons—some seeds may germinate in fall and overwinter as dormant seedlings.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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