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Flowering rush

Butomus umbellatus · Butomaceae

The gardener's calendar

The right move for September

Ideal time to plant flowering rush: 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, pale pink flowers in umbels
Mature size
60 to 100 cm in height
Growth
Moderate to fast
Hardiness
Down to -15°C
Natural habitat
Wetlands, lakes and rivers of Eurasia
Soil type
Rich, moist, slightly acidic

Care

Watering

Flowering rush is an aquatic or semi-aquatic plant that thrives in partial immersion. Keep the soil constantly moist or plant it at the edge of a pond with 5 to 15 cm of water. In a pot, water generously and never allow the substrate to dry out completely.

Light exposure

Choose a sunny or partially shaded location, ideally with at least 4 to 6 hours of direct sunlight daily. Good light promotes abundant and dense flowering.

Soil and substrate

Use soil rich in organic matter, humus-based and slightly acidic. In a pond, prefer a specialized substrate for aquatic plants. Adding well-decomposed compost at planting time improves structure and fertility.

Fertilizer

Apply a balanced fertilizer in spring when vegetation starts growing again. Moderate feeding during growth is sufficient, as excess nitrogen promotes foliage at the expense of flowers.

Pruning and cleanup

Remove dead leaves and wilted stems in late autumn or early winter. You can cut back the plant slightly after frost passes to stimulate vigorous regrowth in spring.

Diseases and pests

Flowering rush is generally very hardy. Watch for possible filamentous algae in ponds, which can be controlled by maintaining good ecosystem balance. Aerate the water regularly to prevent stagnation and bad odours.

Did you know?

Flowering rush (Butomus umbellatus) is one of only three species in the Butomaceae family, making it a truly unique plant. Its common English name reflects its dual nature: while its sharp leaves resemble aquatic rushes, its delicate pink flowers in umbels bring unexpected elegance to wetlands. Historically cultivated since antiquity, it remains a favourite for natural pond landscaping in Europe.

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.