Common Name: pampas grass
Type: Ornamental grass
Family: Poaceae
Zone: 8 to 10
Height: 4.00 to 5.00 feet
Spread: 2.00 to 3.00 feet
Bloom Time: August to February
Bloom Description: Silver white
Sun: Full sun
Water: Dry to medium
Maintenance: Medium
Suggested Use: Naturalize
Flower: Showy, Good Cut, Good Dried
Tolerate: Drought, Black Walnut, Air Pollution
Culture
Winter hardy to USDA Zones 8-10 where it is best grown in dry to medium moisture, well-drained soils in full sun. Tolerates light shade. Tolerates drought once established. Cut foliage back to the ground in late winter. Clumps may be divided in late winter to early spring. This grass is technically gynodioecious, but usually appears dioecious. Female plants produce prodigious amounts of seed and can self-seed freely, often resulting in naturalization that displaces valuable native plants. This plant is considerably invasive in certain areas of the western United States, particularly California and Hawaii where it is not now recommended for planting. In the St. Louis area (USDA Zone 6), this grass will generally not survive winter, and should be planted in large containers (e.g., whiskey barrels) for overwintering in a greenhouse.
‘Monvin’ is a variegated female cultivar that does not come true from seed. Plants must be propagated by division.
Noteworthy Characteristics
Cortaderia selloana, commonly called pampas grass, is native to Brazil, Argentina and Chile. It was planted around the world in Victorian times, and today is considered to be one of the most popular of the ornamental grasses. This is a tough, large grass that forms dense, substantial clumps (tussocks) featuring arching, finely serrated, narrow green leaves that are topped in fall by huge, feathery, silvery white plumes. It was first introduced into the U. S. in 1848, and for many years now has been grown as an ornamental plant in certain southern and western parts of the U.S. It has also been grown commercially for harvest of its large flower plumes for use in dried arrangements. Leaf blades are extremely sharp (easily cut human skin) and may reach 6-8’ in length. Flower plumes (1-3’ long) may rise to 10-12’ tall on erect stems. Silvery white plumes (sometimes with traces of pink) are more impressive on female plants than on male plants.
Genus name comes from the Argentinian name.
‘Monvin’, sold under the trademarked name of SUN STRIPE, is a variegated female form that is distinguished from the species as follows: (1) leaves are green with longitudinal yellow striping, (2) plants are much smaller, rising to 4-5’ tall, and (3) plants are female only (superior inflorescences to male species plants). Leaf blades are extremely sharp (easily cut human skin) and may reach 40” in length. Feathery, silvery white flower plumes (to 12” long) rise to 4-5’ tall on erect stems. U.S. Plant Patent PP5,136 was issued on November 8, 1983.
Problems
No serious insect or disease problems. Invasively self-seeds in some warm winter areas. Leaf edges are extremely sharp.
Uses
Where winter hardy, this is a large ornamental grass for large landscapes. Excellent specimen. Background plant for borders. Screen. Plumes may be cut and dried for use in indoor flower arrangements. Best grown in containers in the St. Louis area.