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Water parsnip

Sium latifolium · Apiaceae

The gardener's calendar

The right move for September

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

JFMAMJJASOND Planting

ID card

Family
Apiaceae
Form
Herbaceous perennial
Adult height
60 to 100 cm
Foliage
Deciduous
Flowering
June to August
Hardiness
Very hardy (-15°C)
Origin
Europe, temperate Asia
Soil type
Moist, rich in organic matter

Care

Watering

Greater water-parsnip appreciates constantly moist to wet soils. Water regularly during the growing season to maintain persistent moisture, without creating waterlogging. During winter, reduce watering but never let the soil dry out completely.

Light exposure

Position the plant in full sun or partial shade. It tolerates shaded and damp areas well, typically at the edge of a pond or water basin. A location with at least 3 to 4 hours of direct light promotes better growth.

Soil

Choose rich, deep soil that is constantly moist, even marshy. Incorporate compost or peat to improve water retention. This plant is ideal at the water's edge or in damp areas of the garden.

Fertilizing

A moderate application of balanced fertilizer in spring is sufficient. Enrich the soil with well-decomposed compost when planting. Excessive feeding risks promoting foliage at the expense of flowering.

Pruning and maintenance

Cut back the plant in late winter or early spring before growth resumes. Remove dried or damaged stems to maintain a compact shape. Spent flowers can be trimmed to extend the flowering period.

Diseases and pests

Greater water-parsnip is generally resistant to diseases and pests. Excessive stagnant moisture can promote rot. Watch for powdery mildew in cases of poor air circulation, particularly in humid and confined environments.

Did you know?

Greater water-parsnip was long used in Europe for its presumed medicinal properties, particularly in traditional phytotherapy. Its Latin name 'latifolium' means 'broad-leaved', which distinguishes it from its apiaceae cousins. It is a plant highly appreciated by pollinating insects, which make it a valuable stop in late spring.

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.