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Soapwort

Saponaria officinalis · Caryophyllaceae

The gardener's calendar

The right move for September

Ideal time to plant soapwort: 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 September
Adult size
60 to 80 cm tall
Growth
Fast
Hardiness
Very hardy (zone 3 to 9)
Origin
Mediterranean basin in Europe
Soil type
Well-drained, tolerates poor soils

Care

Watering

Soapwort tolerates drought well once established. Water regularly during the first year and during very dry summer periods. Avoid excessive moisture that could promote root rot.

Light exposure

Plant in full sun for optimal flowering. Soapwort also accepts partial shade, but will flower less abundantly. Ensure good air circulation to prevent fungal diseases.

Soil and drainage

Well-drained soil is essential. Soapwort adapts to poor, gravelly or silty soils. Improve drainage by adding sand or gravel if your soil is too clayey.

Pruning and cutting

Remove faded flowers regularly to extend flowering. Cut the plant down to the ground in autumn or early spring. Trim lightly after the first flush of flowers to stimulate new blooms.

Fertilizer

Soapwort needs little nutritional input. A light application of balanced fertilizer in spring is sufficient. Too much nitrogen promotes foliage at the expense of flowers.

Diseases and pests

Relatively robust, it can suffer from powdery mildew or rust if too humid. Ensure good air circulation around the plant and avoid foliage watering. Few pests attack it.

Did you know?

Soapwort gets its name from its exceptional property: its roots and leaves contain saponins, natural compounds that produce soapy foam when in contact with water. For centuries, it was cultivated and used as natural soap to clean delicate textiles, particularly tapestries and precious fabrics in European castles.

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.