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Broadsword

Samolus valerandi · Primulaceae

The gardener's calendar

The right move for September

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

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ID card

Family
Primulaceae
Form
Herbaceous
Adult size
20 to 40 cm in height
Flowering
June to September
Foliage
Deciduous
Hardiness
Hardy down to -15°C
Origin
Temperate and subtropical regions of Europe and Asia

Care

Light exposure

Samole prefers partial shade or light shade. However, it will tolerate full sun if soil moisture is maintained. Place it near a pond, at the edge of a wetland or in a moist area where light is filtered.

Soil and substrate

This plant thrives in moist, peaty or organically rich soils. It particularly appreciates cool to wet terrain and even tolerates temporarily flooded areas. Slightly acidic to neutral soil is ideal.

Watering

Keep the soil consistently moist, without permanent saturation. During the growing season (spring-summer), water regularly. In winter, reduce slightly but do not let the substrate dry out completely.

Pruning and maintenance

Little pruning is necessary. Remove spent flowers to prolong blooming and encourage new flower production. In late winter, cut back lightly to maintain a compact form.

Fertilizing

A moderate application of balanced fertilizer in spring is sufficient. Favour organic matter (well-decomposed compost) rather than chemical fertilizer. Avoid overfeeding, which would promote foliage at the expense of flowers.

Diseases and pests

Samole is generally robust. Watch for powdery mildew in warm, humid weather without adequate air circulation. Good air movement and avoiding wet foliage reduce risks. Not particularly susceptible to common pests.

Did you know?

Samole (Samolus valerandi) is a discreet companion of wetland areas that carries within it a long history of botany. Its common English name is little known, whereas botanists have designated it since antiquity; it appears in medieval treatises on marsh plants. Today, it remains an excellent plant for water gardens, peatlands and ecological developments that promote biodiversity in wetland areas.

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.