How to Grow Pampas Grass
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Pampas Grass
Cortaderia selloana
grassPampas grass is a large, dramatic ornamental grass native to South America, prized for its tall, feathery plumes that tower above silvery-green foliage. It creates a striking focal point in landscapes, reaching 8-12 feet tall with plumes extending even higher. The plant thrives in warm climates and is valued for its graceful, wind-responsive movement and striking late-summer to fall displays.
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Example Pampas Grass timeline · Pittsburgh, PA (Zone 6b)
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Plant Pampas Grass
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 Pampas Grass
Late summer into fallBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 7-11; can survive zone 6b with winter protection
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Establishment
First 6-12 monthsYoung plant with tufts of narrow, silvery-green foliage; no plumes yet
Water regularly to establish deep roots; mulch around base to retain moisture; remove any dead foliage
Vegetative Growth
Year 1-2Plant develops larger clumps of attractive arching foliage; height increasing gradually
Continue regular watering during dry periods; apply balanced fertilizer in spring; monitor for pests; thin out dead growth
Plume Development
Late August-OctoberTall inflorescences emerge from the center of the clump, initially green then turning silvery-white
Plumes typically appear in late summer/early fall; provide support in windy areas; avoid nitrogen-heavy fertilizers which delay flowering
Flowering & Plume Display
September-NovemberFeathery, plume-like flower structures fully developed, creating dramatic silvery-white display
Plumes can persist through winter if not cut; appreciate the architectural beauty; harvest plumes for dried arrangements if desired
Winter Dormancy
December-FebruaryFoliage may brown or remain silvery; plumes persist but gradually shed seeds; plant enters dormancy
In zones 6-7, cut back to 12 inches in late winter before new growth emerges; in warmer zones, maintain minimal trimming; protect in harsh winters with burlap wrap
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use miticides if infestation severe; ensure adequate air circulation
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Remove by hand; apply insecticidal soap; severe infestations may require systemic insecticide
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Prune affected foliage; apply horticultural oil spray in dormant season
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Ensure excellent drainage; avoid excessive watering; improve soil with sand/gravel; remove affected plants if necessary
Uses
Dried flower arrangements
CraftPampas grass plumes are highly valued for dried and fresh arrangements, providing dramatic height, texture, and longevity in floral designs. The plumes can last years in dried arrangements without fading significantly. [source]
Privacy screening and windbreaks
HouseholdMature pampas grass plants create natural privacy barriers and can serve as windbreaks in landscaping. Their tall, dense growth provides effective screening of unsightly views or structures. [source]
Bird and pollinator habitat
WildlifeThe dense foliage provides shelter for birds and beneficial insects, while the flowering plumes attract pollinators during late-season blooming. [source]
Ornamental landscape focal point
HouseholdPampas grass serves as a stunning architectural element and specimen plant in contemporary and tropical landscape designs. Its dramatic form and movement in wind create visual interest year-round. [source]
Cultural and ceremonial uses
CulinaryIn South America, pampas grass holds cultural significance and has historically been used for thatching and ceremonial purposes. The silvery plumes have symbolic importance in traditional practices. [source]
Harvest Tips
For dried arrangements, cut plumes in early fall when fully emerged but before seeds disperse; cut stems 2-3 feet long just below the plume; hang upside down to dry in a cool, well-ventilated space for 2-4 weeks. For foliage pruning, cut back entire plant to 12 inches in late winter/early spring (zones 6-7) or maintain minimal pruning in warmer zones. Wear gloves as foliage edges are sharp.
Fun Facts
- 🌱 A mature pampas grass plant can produce over 100,000 seeds per plume, dispersing them via wind—this prolific reproduction has made pampas grass invasive in some regions like California, Australia, and New Zealand, where it is now restricted or banned in several areas
- 🌱 Pampas grass can live 15-20 years or longer, and mature clumps can reach 12 feet tall with plumes extending several feet higher, making them one of the tallest ornamental grasses available
- 🌱 The silvery-white plumes are actually the inflorescence (flower structures), and they can remain on the plant throughout winter, providing year-round architectural interest and being particularly striking when frosted or snow-covered
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