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Giant hogweed

Heracleum sosnowskyi · Apiaceae

The gardener's calendar

The right move for September

Ideal time to plant giant hogweed: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Deciduous
Flowering
June to August, white or pink flowers in umbels
Adult size
1.5 to 2.5 m in height
Growth
Very fast
Hardiness
Zone 4-5 (down to -20 °C)
Origin
Caucasus (Georgia)
Soil type
Rich, fresh to moist, well-drained

Care

Exposure

Choose a sunny to partially shaded location for optimal flowering. This plant tolerates slightly shaded spots, but thrives best with 4 to 6 hours of direct sunlight. However, avoid excessively scorching exposure in very hot climates.

Watering

Keep the soil fresh and regularly moist during the growing season, especially during hot periods. Gradually reduce watering in autumn. Soil that is too dry compromises development and flowering.

Soil

Prepare soil rich in organic matter, deep and well-structured, preferably fresh to moist but without waterlogging. Adding compost in spring promotes vigor. Neutral to slightly acidic pH is ideal.

Fertilizer

Apply balanced fertilizer in spring when growth resumes, and possibly a second application in early summer. A well-established plant in rich soil does not require intensive fertilization.

Pruning and maintenance

No strict pruning is necessary; simply remove faded flower heads to encourage branching. Remove damaged or diseased stems in spring. Cut back the plant in autumn or late winter before regrowth.

Diseases and pests

Generally robust, it may encounter aphids or whiteflies if water-stressed. Ensure good air circulation and regular watering to prevent fungal issues. Inspect foliage regularly, particularly at the start of the season.

Did you know?

Sosnowsky's hogweed is infamous for its photosensitizing sap that causes chemical burns when it contacts skin exposed to sunlight (phytophotodermatitis). Native to the Caucasus, it escaped from botanical gardens and ornamental plantings in Europe, becoming invasive in several regions. Due to these health and ecological risks, its cultivation is prohibited or regulated in several European countries.

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.