Elecampane
Inula helenium · Asteraceae
The gardener's calendar
Ideal time to plant elecampane: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- July to September
- Mature size
- 1.5 to 2.5 m tall × 0.8 to 1.2 m wide
- Growth
- Moderate to fast
- Hardiness
- Very hardy (down to -20°C)
- Origin
- Southern Europe and South-Western Asia
- Soil type
- Fresh, well-draining, tolerates poor soils
Care
Watering
Water regularly during spring and summer growth, keeping the soil fresh but not waterlogged. Once established, Elecampane tolerates dry periods well. Reduce watering in autumn and winter. Prefer deep watering over frequent, shallow watering.
Light
Plant Elecampane in full sun for generous flowering and vigorous growth. It tolerates partial shade, but flowers less abundantly. Avoid dense shade, which encourages weak growth and reduces flower quality.
Pruning and maintenance
Cut the clump down to ground level in late autumn or early spring, once stems become woody. Remove spent flowers regularly to encourage new blooms. Divide the plant every 3 to 4 years to rejuvenate the clump and control its spread.
Feeding
A spring application of well-rotted compost is usually sufficient. Elecampane is undemanding and thrives even in poor soils. Avoid nitrogen-rich fertilisers, which stimulate foliage at the expense of flowering.
Soil
Prefer well-draining, fresh, moderately fertile soil. Improve heavy soils with sand or compost. Although adaptable, the plant dislikes waterlogged conditions and constantly wet soils, which can cause root rot.
Diseases and pests
Elecampane is generally hardy. Watch for powdery mildew in dry periods or excessive humidity. A few aphids may appear, treatable by spraying with soapy water. Good air circulation and watering at the base reduce health risks.
Did you know?
Elecampane, also called Inula or Horseheal, is a plant with a rich medieval tradition: it was cultivated in monastery gardens since the Middle Ages for its historically reputed properties for respiratory health. Its name 'Helena' is said to come from an ancient legend where Helen of Troy cultivated this plant in her 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.
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Tips generated and checked by Viridia — adapt them to your local climate.