Thapsia villosa
Thapsia villosa · Apiaceae
The gardener's calendar
Ideal time to plant thapsia villosa: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Apiaceae
- Type
- Perennial herbaceous plant
- Foliage
- Deciduous
- Flowering
- June to August, yellow flowers in umbels
- Mature size
- 80 to 150 cm tall
- Hardiness
- Zones 8-10 (down to -12°C)
- Origin
- Mediterranean Basin (Spain, Morocco)
- Soil
- Well-drained, calcareous, dry to moderately moist
Care
Sunlight
Place thapsia in full sun, which is essential for vigorous growth and generous flowering. It tolerates very sunny and hot locations without issue. Avoid overly shaded areas where it would decline.
Watering
Water moderately when planting and during the first growing season. Once established, thapsia is very drought-tolerant and requires almost no additional watering. In Mediterranean or arid climates, stop watering in summer.
Soil and drainage
Light, well-drained soil that is preferably calcareous is essential to prevent root rot. Improve if necessary with gravel or coarse sand. Thapsia refuses heavy or constantly wet soils.
Pruning and cleanup
No pruning is strictly necessary. In late winter or early spring, remove dry stems and dead leaves. Let the plant self-seed naturally if desired, or cut it back after flowering to control its spread.
Fertilizing
Undemanding, thapsia requires no regular feeding. A light spring application of compost is sufficient on poor soils. Avoid excess nitrogen, which would promote foliage at the expense of flowering.
Pests and diseases
Robust and relatively insensitive to pests when grown in suitable conditions. The main risk is root rot in overly wet soil. Some aphids may appear but rarely cause significant damage.
Did you know?
Thapsia villosa was long used in traditional Mediterranean medicine for its supposed properties, but be careful: like many plants in the Apiaceae family, it contains furanocoumarins that can cause skin irritation with repeated contact or sun exposure. Its spectacular tall yellow umbels make it an attractive ornamental plant, however, particularly prized in contemporary dry 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.