Invasive Plant

Flowering rush

Butomus umbellatus

About This Species

Flowering rush is an aquatic perennial with green, grass-like foliage and pink almond-scented flowers. It can be difficult to identify as it resembles several native species, but quickly crowds out other plants. It is considered a noxious weed throughout the province. It impedes the use of shallow waters for recreation, irrigation & industrial activities, and alters natural ecosystems.

How to Identify

Flowering rush typically grows in shallow waters but can survive in water as deep as 6 m. Stems range from 1-1.5 m tall and sprout from the crown of the plant. Flowers in pink umbrella shaped clusters on delicate, 5-10 cm long flower stalks. Two key identification features are the distinct triangular cross-section of the leaves and roots that are thick with bulbous nodes.


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Take Action

Prevention is important for this plant – be sure not to trade or sell this plant. Be sure to “Clean, Drain, Dry” your boats and recreational equipment when leaving a site where Flowing rush is present. As this plant has not yet become established in BC, be on the lookout for it!

Clean, Drain, Dry

Learn about best practices

The Clean Drain Dry program empowers you to help reduce the spread of invasive plants and organisms to BC waters by following the clean, drain, dry procedure on all watercraft and equipment.



Learn about best practices

A few non-invasive alternatives to plant instead of Flowering rush include:

Go Further


Help protect BC from Invasive Species.