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Marsh spurge

Euphorbia palustris · Euphorbiaceae

The gardener's calendar

The right move for September

Ideal time to plant marsh spurge: 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
Spring (April-May)
Adult size
80 to 120 cm in height
Growth
Moderate to fast
Hardiness
Very hardy (-15°C)
Origin
Central and Eastern Europe
Soil type
Moist to fresh, tolerant

Care

Watering

Marsh spurge appreciates constantly moist but not waterlogged soil. Water regularly during the growing season, especially in dry spells. In winter, reduce watering as the plant goes dormant.

Light exposure

Place it in full sun or partial shade for generous flowering. It tolerates partially shaded spots well, particularly in hot regions where light summer shade limits water stress.

Soil

Prefer rich, moist to fresh soil. This spurge adapts well to chalky or slightly alkaline soils too. Add compost in spring to enrich the substrate and encourage growth.

Pruning and cutting

Cut stems just above ground level in late winter or early spring, before new growth begins. This promotes dense branching and a more compact shape. Remove spent flowers to extend secondary flowering.

Fertilizing

A balanced fertilizer application in spring is usually sufficient. In poor soil, supplement with organic fertilizer every two months during the growing season. Avoid excess nitrogen, which promotes foliage at the expense of flowers.

Diseases and pests

Marsh spurge is generally robust and rarely subject to diseases. Watch for powdery mildew in overly dry or confined conditions. Good drainage and adequate air circulation prevent most common fungal problems.

Did you know?

Marsh spurge is among the oldest plants in European gardens, valued since the Middle Ages for its vigor and remarkable chartreuse inflorescences. The genus name Euphorbia honors Euphorbus, physician to the king of Mauritania, renowned for his knowledge of medicinal plants. Be careful though: like all spurges, its sap can irritate skin; handle it with gloves.

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.