Red fountain grass brings dramatic colour to Canadian gardens with its burgundy leaves and feathery plumes. This tender perennial grass creates stunning focal points in borders, containers, and landscape beds from coast to coast.

While rubrum pennisetum setaceum needs winter protection in most of Canada, gardeners have developed reliable methods to enjoy it year after year. This guide covers everything from planting to overwintering, with practical tips for our climate.

Red fountain grass with burgundy leaves and feathery plumes growing in a garden

Red fountain grass showing its characteristic burgundy foliage. Photo: Wikimedia Commons.

Table of Contents

1. Understanding Red Fountain Grass

This ornamental grass forms graceful mounds about 90 to 120 cm tall, with arching burgundy-red leaves that deepen in colour through summer. From July to September, it produces fluffy bottlebrush plumes in rosy-purple tones that dance in the breeze and catch morning light beautifully.

In Canada, gardeners treat it as an annual in zones 2 to 5, or overwinter it indoors in colder regions. It thrives in zones 6 and warmer outdoors year-round, though even there a thick mulch helps. The plant is sterile, so it will not self-seed aggressively like some ornamental grasses.

Close-up of purple fountain grass plumes with burgundy foliage

Feathery plumes emerging from burgundy foliage. Photo: Wikimedia Commons.

2. Choosing the Right Planting Location

Pick a spot with full sun for at least six hours daily. The red colour intensifies with more sunlight, turning almost purple-black in hot, sunny positions. In partial shade the leaves stay greener and the plant grows leggier, so prioritize the sunniest bed you have.

Allow 60 to 90 cm of space around each plant. Though they start small in nursery pots, these grasses bulk up fast by midsummer. Good air circulation between clumps prevents fungal issues during humid Ontario and Quebec summers. For more flower bed ideas to elevate your garden, consider how the grass pairs with neighbours.

Red fountain grass planted in a garden bed at a botanic garden

Red fountain grass thriving in a sunny garden bed. Photo: Wikimedia Commons.

3. Soil Preparation and Planting

This grass adapts to most soils but performs best in well-drained loam with a neutral to slightly acidic pH. Before planting, loosen the soil to 30 cm deep and mix in 5 cm of compost. Avoid heavy clay that stays soggy, as wet roots in spring cause rot.

Plant after the last frost when nighttime temperatures stay above 10°C, typically late May in southern Ontario and early June on the Prairies. Set the crown level with the soil surface, water deeply, and mulch with 5 cm of bark to retain moisture. Space plants 75 cm apart for a lush drift effect.

Pennisetum setaceum grass with seed heads in natural setting

Fountain grass seed heads in detail. Photo: Wikimedia Commons.

4. Watering Wisely Through Summer

New plantings need consistent moisture for the first month, about 2 to 3 cm of water per week. Once established, red fountain grass tolerates drought well and prefers to dry slightly between waterings. Overwatering leads to floppy growth and washed-out colour.

Water at the base in the morning to keep foliage dry. During heat waves above 30°C, container plants may need daily watering while in-ground clumps manage with twice-weekly deep soakings. A rain gauge helps you track natural rainfall so you only supplement when needed.

Red fountain grass clump with arching burgundy leaves

A healthy clump with arching burgundy leaves. Photo: Wikimedia Commons.

5. Feeding for Best Colour

These grasses are light feeders. A single application of balanced slow-release fertilizer (such as 14-14-14) in late May is enough for the season. Too much nitrogen pushes soft green growth at the expense of the rich burgundy tones gardeners want.

If leaves look pale, a half-strength liquid seaweed feed in July perks them up without overstimulation. Avoid fertilizing after mid-August so growth hardens before autumn. For fall colour planning, see these perennials to plant in fall that complement ornamental grasses.

Red fountain grass growing alongside other plants in a garden

Red fountain grass combined with garden companions. Photo: Wikimedia Commons.

6. Growing in Containers

Containers are ideal for Canadian gardeners who want to overwinter their grass indoors. Choose pots at least 35 cm wide and deep with drainage holes. Use a quality potting mix blended with 20 percent perlite for drainage, as this plant hates waterlogged roots.

Place pots where they get full sun on patios or balconies. Container grasses need more frequent watering than in-ground plants, sometimes daily in July heat. Move pots to a sheltered spot before the first hard frost, usually early October in most provinces.

Fountain grass with fluffy seed plumes

Fluffy plumes at their peak in late summer. Photo: Wikimedia Commons.

7. Overwintering Indoors

Before the first frost, cut the grass back to 15 cm and dig up the root ball. Pot it in fresh mix and place in a cool, bright spot like an unheated garage or basement window where temperatures stay between 5 and 10°C. Water sparingly, just enough to keep roots from drying out completely.

In March, move the pot to a warmer, sunnier location and resume regular watering. New burgundy shoots emerge as days lengthen. Harden plants off for a week before moving outdoors after the last frost. This method saves the $15 to $25 cost of buying new plants each spring.

Pennisetum setaceum grass detail showing fine foliage

Fine foliage detail of fountain grass. Photo: Wikimedia Commons.

8. Dividing Established Clumps

Every two to three years, clumps become congested in the centre with reduced vigour. Divide in late May when new growth reaches 15 cm tall. Dig up the entire root ball and use a sharp spade to cut it into quarters, ensuring each division has roots and shoots.

Replant divisions immediately at the same depth, water well, and mulch. This is also the perfect time to share with neighbours or expand your plantings. For border design inspiration, explore these landscaping ideas along fences where grasses add softness.

Red fountain grass growing in a park setting

Red fountain grass in a landscaped park. Photo: Wikimedia Commons.

9. Companion Planting Ideas

The burgundy foliage pairs beautifully with silver-leaved plants like artemisia and dusty miller, which make the red tones pop. Yellow flowers such as black-eyed Susans and coreopsis create striking contrast, while purple coneflowers echo the plume colours for a harmonious look.

For dried arrangements, cut plumes in early September before they fully open and hang upside down in a dark shed. They hold colour well for months. Fresh or dried, these grasses also work in dried pampas grass decor ideas for indoor styling through winter.

Pennisetum setaceum rubrum with red foliage and plumes

Rich red foliage with emerging plumes. Photo: Wikimedia Commons.

10. Troubleshooting Common Problems

Few pests bother this grass, but aphids sometimes cluster on new plumes in June. A strong jet of water dislodges them, or insecticidal soap handles heavier infestations. Rust spots on leaves indicate poor air circulation; thin the clump and avoid overhead watering.

If your grass stays green instead of turning burgundy, it needs more sun. Leggy growth with few plumes usually means too much shade or excess nitrogen. Cut back spent plumes in late autumn to keep beds tidy, but leave 15 cm of stubble to protect the crown.

Red fountain grass planted with echium in a garden bed

Red fountain grass paired with tall echium flowers. Photo: Wikimedia Commons.

FAQs

Is red fountain grass perennial in Canada?

It is hardy only in zone 6 and warmer, so most Canadians grow it as an annual or overwinter it indoors.

How tall does rubrum pennisetum get?

Expect 90 to 120 cm tall and 60 to 90 cm wide by late summer in good conditions.

Can it survive winter in Toronto?

Toronto is zone 6, so it may survive mild winters with heavy mulch, but indoor overwintering is more reliable.

Does it spread aggressively?

No, the Rubrum cultivar is sterile and will not self-seed, unlike some other fountain grasses.

When should I cut it back?

Cut to 15 cm in late autumn before overwintering, or in early spring for in-ground plants in mild zones.

Final Thoughts

Red fountain grass rewards Canadian gardeners with months of burgundy drama for very little effort. Whether you treat it as an annual, overwinter it in the garage, or garden in a mild coastal zone, the key is full sun and well-drained soil. Start with one plant this spring and you will likely want a drift of them by next year.

Sources

Gallery

Dense clump of purple fountain grass with seed heads

A dense, mature clump in full plume. Photo: Wikimedia Commons.

Red fountain grass with burgundy leaves in garden

Burgundy foliage glowing in sunlight. Photo: Wikimedia Commons.

Pennisetum setaceum Rubrum growing in Hong Kong Park

Red fountain grass in a public garden. Photo: Wikimedia Commons.


 

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