Pampas Grass (Cortaderia selloana) Care Guide

Plant Snapshot

Common Name: Pampas Grass
Latin Name: Cortaderia selloana
Hardiness Zones: USDA zones 7–11 with variation by cultivar and location
Typical Height: 6–11 ft (180–335 cm) overall including plumes; foliage often 4–8 ft (120–240 cm)
Typical Spread: 6–10 ft (180–300 cm) wide as a mature clump
Bloom Period: Late summer to fall; timing varies with climate
Soil Preferences: Prefers well drained, fertile to average soils. Tolerates poor, sandy and coastal soils. Avoid waterlogged or heavy clay that stays wet
Light Preferences: Full sun for best flowering and form. Light afternoon shade tolerated but shade reduces plume production
Toxicity: Not widely reported as poisonous to people or pets. Primary risk is mechanical injury from very sharp leaf margins and airborne fluff may irritate eyes or respiratory tract
Propagation: By seed and by division of clumps. Seed spreads by wind and can readily naturalize. Divide established clumps in spring

Key Facts

Large perennial bunching grass with showy feathery plumes in late summer and fall
Forms dense clumps of arching, blade like leaves
Prefers full sun and flowers best in open sites
Tolerant of drought and coastal exposure once established
Does not tolerate poorly drained, waterlogged soil
Propagates by seed and by dividing clumps
Can naturalize and become invasive in mild climates
Leaf margins are sharp and can cut skin

Pampas Grass is a large ornamental clump grass grown for its showy feathery plumes. Gardeners often worry about its size and tendency to naturalize in mild climates and whether it is suitable for indoor use.

Identification

Pampas Grass, Cortaderia selloana, forms dense clumps of arching, blade like leaves and produces tall feathery plumes in late summer to fall. Mature plants including plumes typically reach about 6 to 11 feet tall and form clumps roughly 6 to 10 feet wide. Leaf margins are very sharp and can cut skin.

Where to grow Pampas Grass

Grow it outdoors in a sunny, open site for the best display of plumes. It tolerates drought and coastal exposure once established and does well in well drained, average to poor soils including sandy sites. Use it as a specimen screen, windbreak or in large mixed borders where its size is appropriate.

Hardiness and bloom timing

General guidance places Pampas Grass in USDA zones 7 to 11 but performance varies by cultivar and location. It blooms in late summer into fall. Exact months shift with local climate and hemisphere, so confirm timing for your area.

Planting season, depth and spacing

Plant divisions and new plants in a cool season such as spring to give roots time to establish. Allow space for a mature clump by spacing plants about 6 to 10 feet apart depending on the variety and site. Do not plant where soil stays waterlogged.

Water and soil

Pampas Grass prefers well drained soil. It tolerates a wide range of soil fertility and once established is drought tolerant. Poor drainage or waterlogged soil reduces vigor and can cause decline.

After‑flowering care

Leave plumes for winter interest if you wish then cut back old flowering stalks and dead foliage in late winter or early spring before new growth begins. When removing old foliage use gloves and eye protection because leaves are sharp.

Spread and controlling naturalization

The species propagates by seed and by division. Seed is wind dispersed and can lead to naturalized populations where winters are mild. To reduce spread deadhead or remove seed heads before they shed seed and remove volunteer seedlings. Check local regulations before planting since Pampas Grass is listed as invasive or noxious in some areas.

Safety and handling

Pampas Grass is not widely reported as poisonous to people or pets. The main hazards are mechanical injury from very sharp leaf margins and occasional irritation from airborne plume fluff. Use sturdy gloves and eye protection when pruning or removing material. For ingestion concerns consult local poison control or veterinary resources.

Propagation

Propagate by dividing established clumps in spring or by seed. Division is the easiest way to make new plants and to reduce a large clump. Because seed spreads readily avoid letting seed heads mature if invasiveness is a concern.

Frequently asked questions

How fast does Pampas Grass grow?: Growth rate varies by site and cultivar. Plants commonly form substantial clumps and produce flowering plumes within a few growing seasons once established.
Is Pampas Grass invasive?: It can naturalize and become invasive in mild climates because seed spreads by wind. Many jurisdictions restrict planting so check local rules before planting.
Are Pampas Grass leaves poisonous?: There are no widespread reports of major poisoning from ingestion. The primary risk is cuts from sharp leaf margins and possible eye or respiratory irritation from plume fluff.
How do I stop it spreading?: Remove or deadhead seed heads before they shed seed, pull or dig out seedlings, and divide and remove parts of large clumps if needed. Follow local guidelines for disposal where it is considered invasive.