Famous for its unmistakable feathery white plumes, pampas grass (Cortaderia selloana) adds beautiful texture to outdoor spaces. Pampas grass is a large, ornamental grass, growing up to 10 feet high and wide. Planted in the spring, these large grasses are very fast growers and can quickly become invasive. Male and female flowers are produced on separate plants. Female pampas grass is most often seen because of its showier plumes.
|Botanical Name||Cortaderia selloana|
|Common Name||Pampas grass|
|Mature Size||5-10 ft. tall, 5-10 ft. wide|
|Sun Exposure||Full, partial|
|Soil Type||Loamy, moist but well-drained|
|Soil pH||Acidic, neutral|
|Bloom Time||Summer, fall|
|Flower Color||Pink, yellow, white|
|Hardiness Zones||7-10, USA|
|Native Area||South America|
Pampas Grass Care
Pampas grass is simple to maintain once established and often only requires yearly pruning. This hardy grass is tolerant of wind, drought, and salt spray from coastal areas. It is also resistant to most diseases and pests. By pruning the plant to the ground in late winter or early spring, you will keep its surroundings clear and encourage new growth each season.
Because this plant is very combustible, keep it away from buildings, outdoor cooking places, and open fires. Because of its proclivity for self-seeding, it may be better to grow a sterile plant to prevent the possibility of pampas grass overtaking your land.
Pampas grass grows swiftly and self-seeds effortlessly. This grass may swiftly overpower other plants and is very difficult to eradicate once established. Before planting, check to see whether this plant is considered invasive in your region. It is classified as invasive in Australia, New Zealand, and the west coast of the United States.
This grass prefers full sun, but it will thrive in moderate shade as well. Too much shadow might generate moist soil, which can lead to fungal issues.2
Moist, well-draining soil that is rich in nutrients will keep pampas grass very happy. The soil’s ability to drain well is key for healthy pampas grass. Compost is a good soil amendment for area with pampas grass, since it enriches the soil and promotes drainage.
Pampas grass is drought tolerant. Established grasses should receive plenty of water from natural rainfall unless there is an extreme drought. For new plants, water them deeply right after planting. You may wish to water intermittently for the first few months to ensure that your grass receives enough water. After this, natural rainfall will provide all the water this plant needs.
Temperature and Humidity
Pampas grass thrives in hot climates. Native to South America, these grasses withstand both heat and high humidity. On the other hand, these hardy grasses can also withstand cold winters and even some snow.
Fertilizer, whether used or not, will not make or break these fast-growing grasses. To stimulate new growth, use a well-balanced fertilizer after trimming in late winter or early spring.
Types of Pampas Grass
There are several varieties of pampas grass.
- Cortaderia selloana ‘Pumila’ : Also known as dwarf pampas grass, this cultivator can be found with plumes that range from pale yellow to ivory. Because it is a compact variety, it grows up to five feet tall. This makes it a great choice for containers.
- Cortaderia selloana ‘Sunningdale Silver’ This cultivar has silver plumes, as the name suggests. They may reach a height of 10 feet and are less prone to clumping.
- Cortaderia selloana ‘Rendatleri’ : This “pink feather” cultivator is famous for its stunningly pink plumes and grows up to eight feet tall.
Pruning should be done once a year to keep the area clean and to encourage new growth. In the late winter or early spring, prune these grasses right to the ground. Be sure to wear protective gear, as the blades of grass are very sharp. Gloves, eye protection, and long pants and sleeves are important.
Propagating Pampas Grass
Division is an easy way to propagate pampas grass. Here’s how it’s done:
- After trimming the plant to the ground, split it and its root system with a sharp spade.
- Slowly dig around the divided clump until you can lift it off the ground.
- Fill in the hole and transfer the divided plant to its own area. If planted near existing grasses, space six to eight feet apart to allow sufficient room for growth.
How to Grow Pampas Grass From Seed
Pampas grass seeds are readily cultivated. Take the following steps:
- Cover seeds lightly with well-draining, rich soil.
- Cover the pots with plastic bags or plastic domes.
- Place the pots in an area with bright, indirect light.
- Germination should occur in about three weeks.
- When the seedlings are large enough to handle, repot them into larger pots.
- When they begin to take on a bushy appearance, plant them outdoors after all threat of frost is gone.
Potting and Repotting Pampas Grass
Though it can grow to be quite large, pampas grass can be kept in containers, especially the dwarf varieties. Because of its large size, it’s best to choose a large container with plenty of room for growth. When the pampas grass fills the pot, either divide the clump or transition the plant to a larger pot. To do this, tip the grass onto its side and tap the outside of the pot until the roots come free.
Place in its new pot and fill it in with rich, well-draining soil. Whatever pot you choose, be sure there are drainage holes to prevent any standing water.
These hardy plants do not require much attention to survive the winter. In fact, they do the best when left alone until it’s time to prune in late winter or early spring. Leaving the foliage will create a natural protective layer for the plant. Additionally, you may wish to add an extra layer of mulch to help insulate the plant.