My garden, alive in my pocket.
Track my garden
🌿

Calamagrostis purpurea

Calamagrostis purpurea · Poaceae

The gardener's calendar

The right move for September

Ideal time to plant calamagrostis purpurea: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

JFMAMJJASOND Planting

ID card

Foliage
Deciduous, turning purple in autumn
Flowering
July to September, purple spikelets
Adult size
120 to 150 cm in height
Growth
Fast to moderate
Hardiness
Excellent, down to -20 °C
Origin
Central and Eastern Europe, mountainous regions
Soil type
Moist to cool, tolerates stagnant moisture
Exposure
Sun to partial shade

Care

Watering

Calamagrostis purpurea appreciates cool, moist soils. Water regularly during the growing season (spring-summer), especially during prolonged dry spells. Once established, the plant tolerates stagnant moisture well, making it ideal for marshy areas or near water features.

Exposure

Install this grass in full sun to achieve the most beautiful purple colors, especially in autumn. It tolerates partial shade but plant development and flower color will be less spectacular. Avoid locations too exposed to strong winds that can bend the stems.

Soil

Calamagrostis purpurea prefers soil rich in organic matter, cool to moist, slightly acidic to neutral. It adapts to different textures provided drainage isn't excessive. Adding compost at planting time facilitates establishment.

Pruning and cutting

Cut the clump back to ground level in late winter (February-March), before spring regrowth, or leave the dried stems in place all winter for a landscape effect. You can cut back faded spikelets in autumn to encourage a second discreet flowering.

Fertilizer

Balanced fertilization in spring (NPK) is generally sufficient. For poor soils, apply well-decomposed compost at the start of the season. Avoid excess nitrogen, which would weaken stems and reduce purple coloring.

Diseases and pests

Calamagrostis purpurea is robust and rarely subject to disease. Excessive moisture can occasionally promote rust or root rot, but this remains rare. Maintain good air circulation and avoid planting too densely.

Did you know?

Calamagrostis purpurea is appreciated by modern landscapers for its graphic form and purple spikelets that persist long into winter, offering ornamental interest even in the cold season. Its dried stems create spectacular plays of shadow and light at sunset, making it a prime choice for contemporary gardens and plantings on moist soils where few other plants thrive as easily.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

Add this plant to my garden →

Plants from the same family

Browse all plants →

Tips generated and checked by Viridia — adapt them to your local climate.