Themeda triandra
Themeda triandra · Poaceae
The gardener's calendar
Ideal time to plant themeda triandra: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Poaceae (grasses)
- Foliage
- Deciduous to semi-evergreen depending on climate
- Flowering
- Summer to autumn (July-October)
- Mature size
- 0.8 to 1.5 m in height
- Growth rate
- Fast
- Hardiness
- Moderate (-5 to -10 °C depending on origin)
- Origin
- South Africa and tropical African regions
- Soil type
- Well-drained, tolerant to poor
Care
Watering
Themeda triandra appreciates regular watering during its first year of establishment, especially during dry periods. Once well-rooted, it tolerates drought and requires little watering in temperate zones. Avoid excess winter moisture, which can rot the rhizomes.
Light exposure
This grass requires full sun to develop its characteristic golden foliage and generous flowering. It can tolerate light shade, but its vigor and appearance will be diminished.
Pruning and maintenance
Cut back the clump to 10-15 cm from the ground in late winter (February-March), before growth resumes. This removes dried foliage and stimulates new leaf emergence. You can also leave the ornamental flower spikes in place until late autumn.
Soil preparation
Themeda triandra thrives in well-drained, light and even poor soil. Initial amendment with light organic matter helps establishment. In heavy soil, improve drainage with sand or gravel to prevent waterlogging.
Fertilization
This grass is not very demanding in nutrients. A light to moderate fertilizer application in spring is more than sufficient. Avoid excess feeding, which would promote weak growth and reduce hardiness.
Prevention and health
Themeda triandra is generally robust. However, watch for root rot in waterlogged soils or during very wet winters. Pests are rare; good air circulation and regular pruning keep the plant in good health.
Did you know?
Themeda triandra, locally known as 'chiendzagrass' or 'red grass' in southern Africa, is a culturally and ecologically major grass species. It makes up a significant portion of South African savannas and has historically served as a forage source for livestock and raw material for traditional roof thatching. Its spectacular reddish flower spikes have also inspired many ornamental floral compositions in modern gardens.
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
- Tufted hair grassDeschampsia cespitosa
- Wavy hair-grassAvenella flexuosa
- Purple moor-grassMolinia caerulea
- Reed canary-grassPhalaris arundinacea
- Common quaking grassBriza media
- Creeping soft-grassHolcus mollis
Tips generated and checked by Viridia — adapt them to your local climate.