Cow parsnip
Heracleum sphondylium · Apiaceae
The gardener's calendar
Ideal time to plant cow parsnip: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- June to August, white or pink umbels
- Adult size
- 0.6 to 1.5 m in height
- Growth
- Fast
- Hardiness
- Very hardy (-20 °C)
- Origin
- Europe, temperate Asia
- Soil type
- Fertile, well-drained, tolerates moisture
Care
Exposure
Common hogweed prefers full sun or partial shade. It tolerates varying conditions and grows vigorously in temperate climates. A sunny location encourages generous flowering.
Watering
Water regularly during the growing season, especially in the first few years. Once established, the plant tolerates drought well thanks to its deep root system. Avoid waterlogging in winter.
Soil and planting
Plant in fertile, well-structured and drained soil. Hogweed appreciates fresh soil rich in organic matter. An amendment at planting makes it easier for it to get established.
Pruning and maintenance
This herbaceous plant doesn't require regular pruning. Remove spent flowers to extend flowering and prevent excessive self-seeding. Cut back to ground level after fruiting.
Nutrition
An application of well-decomposed compost in spring is generally sufficient. In poor soil, a balanced organic fertilizer can support growth. Don't exceed the recommended doses to avoid lush, weak growth.
Health and pests
Common hogweed is robust and seldom susceptible to common diseases. Watch for whiteflies and aphids in case of infestation. Good drainage prevents root rot. Handle with caution: the sap can be photo-irritating in sensitive individuals.
Did you know?
Common hogweed has fascinated people since antiquity: its scientific name Heracleum evokes Heracles, as the ancients considered this plant worthy of the mythological hero. In the Middle Ages, its aromatic fruits were used in medicine and cooking, while in the 16th century, its seeds adorned pharmacopeias. Beware: the sap of certain varieties can cause a skin reaction in sunlight (phytophotodermatitis) in some sensitive people.
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
- CarawayCarum carvi
- MasterwortAstrantia major
- SamphireCrithmum maritimum
- Flat sea hollyEryngium planum
- Shrubby Hare's EarBupleurum fruticosum
- Crowfoot-leaved hare's-earBupleurum ranunculoides
Tips generated and checked by Viridia — adapt them to your local climate.