Flowering Rush

Description

Flowering rush (Butomus umbellatus) is a beautiful native perennial marginal plant, valued for its elegant form and soft pink flower heads. Naturally found along pond edges, slow-moving rivers and wetland margins, this aquatic plant thrives in shallow water and boggy ground, making it a versatile choice for wildlife ponds and naturalistic planting schemes.

In summer, flowering rush produces tall stems topped with rounded umbels of star-shaped pink flowers, rising above narrow, upright foliage. The leaves and flowers have historically been used to produce a yellow dye. As a heavy nutrient feeder, Butomus umbellatus is particularly well suited to filtration beds and natural swimming ponds, where it helps improve water quality.

Although flowering rush is considered an invasive plant species in North America, it is a native UK pond plant and an important component of British wetland habitats.

How to Identify

Flowering rush has slender, grass-like leaves emerging from the base, with smooth, upright flowering stems. The flowers appear in rounded clusters (umbels) of fragrant, rosy-pink flowers, each with narrow petals, typically flowering in early to mid-summer.

How to Grow

Butomus umbellatus grows best at pond margins or in shallow water, with an ideal planting depth of 5–45cm. It prefers full sun and permanently wet or waterlogged soil, but will also grow at or just below the water level. The plant spreads by rhizomes and should be planted directly into the ground or large containers, as it may stop flowering if pot-bound. Once established, it is low-maintenance and reliable in wetland and aquatic planting schemes.