Giant rhubarb
Gunnera tinctoria · Gunneraceae
📷 Rjcastillo · CC BY-SA 4.0
The gardener's calendar
Ideal time to plant giant rhubarb: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Scientific name
- Gunnera tinctoria
- Family
- Gunneraceae
- Form
- Herbaceous perennial
- Adult size
- 1.5 to 2.5 m in height, up to 3 m spread
- Foliage
- Deciduous
- Flowering
- June to July, red or reddish-green spikes
- Hardiness
- -5 to -10 °C depending on varieties
- Origin
- Chile and southern Argentina
Care
Watering
Gunnera tinctoria demands constant moisture, especially during growth and summer. Water regularly during dry periods without allowing water to stagnate at the base. In autumn and winter, gradually reduce watering. Permanently waterlogged soil can promote root rot.
Light and exposure
Position this plant in partial sun or dappled shade. It appreciates a location protected from strong winds that can damage its large leaves. In very hot regions, an east-facing position or light afternoon shade prevents leaf desiccation.
Soil and planting
Gunnera prefers rich, humus-laden soil that is slightly acidic to neutral. Amend generously with compost or potting soil before planting. Deep, well-draining soil is essential to prevent root suffocation. Plant in autumn or spring.
Fertilization
Apply a balanced fertilizer in spring when growth restarts. You can reapply in June-July if growth appears to slow. Rich organic mulch (compost) will also supply nutrients gradually.
Pruning and tidying
No strict pruning is necessary. Simply remove dead or damaged foliage in late autumn or early spring. Remove the oldest leaves near the base to encourage new shoots.
Diseases and pests
Gunnera is generally robust. Watch for slugs and snails that love young leaves. Powdery mildew can appear in hot, dry weather; improve air circulation. Rhizome rot remains the main risk in soil that is too wet and poorly drained.
Did you know?
Gunnera tinctoria, or Chilean giant rhubarb, has fascinated gardeners since its introduction to Europe in the 19th century thanks to its monumental leaves reaching up to 3 metres in diameter. Its name 'tinctoria' recalls its former use by Andean peoples for textile dyeing. This spectacular plant is enjoying renewed interest among modern gardeners seeking dramatic, exotic foliage to create jungle-style 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
- PigvineGunnera magellanica
- Giant rhubarbGunnera manicata
- SageSalvia officinalis
- Pedunculate oakQuercus robur
- GrapevineVitis vinifera
- CamelliaCamellia japonica
Tips generated and checked by Viridia — adapt them to your local climate.