Napier grass
Cenchrus purpureus · Poaceae
📷 Forest and Kim Starr · CC BY 3.0 us
The gardener's calendar
Napier grass is in full bloom: enjoy it, watch watering in hot weather and let spent flowers feed pollinators before pruning.
ID card
- Scientific name
- Cenchrus purpureus
- Family
- Poaceae (grasses)
- Adult height
- 1.5 m
- Foliage
- Deciduous, tender green to purple
- Flowering
- July to September
- Growth
- Fast
- Exposure
- Full sun
- Origin
- Tropical Africa and South Asia
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability medium.
Expert tips
The key tip
Cenchrus purpureus is greedy: add rich compost at planting and a light balanced fertilizer in May-June to support growth. It loves moderate moisture in summer; keep it drier in winter.
The common mistake
Forgetting to fertilize: the plant slows down, stays spindly, thin stems and poor flowering/harvest despite plenty of sun.
The pro's trick
In May, add well-decomposed compost around the base (without touching the stem) and mulch: this regulates moisture and feeds gradually.
Care
Exposure
Elephant grass demands a location in full sun to express its vigour. It tolerates light shade in very hot climates. Place it sheltered from strong winds that could flatten the stems.
Watering
Keep the soil regularly moist during the active growing season (spring and summer). Gradually reduce watering in autumn and minimise it in winter. Avoid stagnant water which would promote root rot.
Soil
This grass adapts to many soil types, but prefers fertile, well-drained loam that is slightly acidic. Adding compost at the start of the season optimises its productivity.
Fertilising
Apply balanced fertiliser in spring and a second application in mid-summer to support its vigorous growth. Reduce fertilising after September.
Pruning and training
Prune hard in late winter before growth resumes, cutting stems back to 10-15 cm from the ground. Regularly remove dry or diseased leaves to open up the clump and encourage new shoots.
Diseases and pests
Generally robust, elephant grass can be affected by fungal rot if stagnant moisture persists. Ensure optimal drainage and good air circulation to prevent these problems.
Did you know?
Elephant grass owes its common name to the fact that this giant grass constitutes a forage appreciated by elephants in Africa. In tropical and subtropical zones, it has been cultivated for decades as a highly productive forage crop, capable of regenerating quickly after cutting and feeding livestock with excellent nutritive potential.
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.