Growing Purple Fountain Grass - How To Take Care Of Purple Fountain Grass

Tall Purple Fountain Grass
purple fountain grass plant
(Image credit: Cara Fealy Choate)

Of all the ornamental grasses, of which there are many, purple fountain grass (Pennisetum setaceum ‘Rubrum') is probably one of the most popular. The purple or burgundy-colored foliage and soft, fuzzy-like blooms (which are followed by purplish seedheads) make a bold statement in the garden—on their own or grouped with other plantings. Growing purple fountain grass is easy and requires little maintenance once established.

About Purple Fountain Grass

While purple fountain grass is known as a perennial, it is actually considered a tender perennial. This ornamental grass cannot survive cold winters and is hardy only in USDA Plant Hardiness Zones 9 and warmer (though in Zones 7-8 it can sometimes reappear given adequate winter protection). 

Therefore, it is important that this be a consideration prior to planting purple fountain grass, as the likelihood of its return each year in zones 6 or lower is slim to none. In fact, in cooler regions the plant is normally treated as an annual instead. 

However, it is still possible to enjoy this plant year after year when grown in a container and brought indoors for overwintering. You can cut it back to about three inches (8 cm.) or so and then place it either in a sunny window in a cool area of the home or simply place it in your basement. 

Keep the plant moist, not soggy, watering it about once a month. Once the threat of freezing weather and frost has passed in spring, you can set the purple fountain grass back outdoors.

Grow Purple Fountain Grass

Growing purple fountain grass is easy. Although it can be planted nearly anytime, spring is the most suitable time for planting. These plants need to be placed in a sunny location with well-draining soil. 

Since mature plants can reach about four feet tall (1 m.) and just as wide, they should be given plenty of room in the garden, spacing additional plants at least three to five feet (1-1.5 m.) apart. Dig a hole both deep and wide enough to accommodate the roots and then water your purple fountain grass thoroughly.

Take Care of Purple Fountain Grass

Caring for purple fountain grass is also easy. The plant is drought tolerant so watering sufficiently every week or two should be adequate. Although not required, you can give it an annual feeding with a slow-release, balanced fertilizer in spring to help stimulate new growth. You should also cut it back in fall prior to bringing the plant indoors or in late winter/early spring for those left outdoors in suitable climates.

Nikki Tilley
Senior Editor

Nikki Tilley has been gardening for nearly three decades. The former Senior Editor and Archivist of Gardening Know How, Nikki has also authored six gardening books.