Pennisetum setaceum ‘Rubrum’, commonly known as Purple Fountain Grass, is a dramatic ornamental grass that brings rich color and graceful movement into the landscape. It’s a standout choice for adding contrast and softness to planting designs.

The foliage is long, arching, and deep burgundy to purple, creating a strong visual presence. The color intensifies in full sun, making it especially effective as a focal point or accent plant.

In summer through fall, it produces soft, feathery flower plumes that rise above the foliage. The blooms have a smoky purple tone and catch the light beautifully, adding texture and motion as they sway in the wind.

It forms a fountain-like clump that adds both height and flow, making it ideal for borders, mass plantings, or containers.

Pennisetum ‘Rubrum’ grows best in full sun and prefers well drained soil. It is fairly drought tolerant once established and performs well in warm climates.

It typically reaches about 3 to 5 feet tall and 2 to 4 feet wide, forming a graceful, arching clump. It is well suited for USDA zones 9 through 11. The foliage is perennial in warm climates but may be treated as an annual in colder regions.

This plant has low toxicity and is generally safe for gardens with pets and children.

The flowers may attract pollinators such as bees.

It is generally deer resistant.

One important consideration is that in some regions, Pennisetum setaceum can reseed and is considered invasive. While ‘Rubrum’ is typically less fertile, it’s still good practice to monitor for unwanted spread depending on local conditions.

Pennisetum setaceum ‘Rubrum’ fits especially well into Mediterranean, modern, and tropical garden designs, where its color and movement can be used to create contrast and rhythm.

It pairs well with plants like Cordyline ‘Electric Pink’ to amplify bold color tones, Agave attenuata to contrast soft movement with sculptural form, and Senecio mandraliscae to introduce a cool toned ground layer that balances the deep burgundy foliage.

Expert Tip:

Place this in full sun to bring out the deepest color, because strong light enhances the rich burgundy tones. Cutting it back at the end of the season will also help refresh growth and maintain a clean appearance.

— Nick from Rooted Theory