Alphabetical Plant Listing

Butomus umbellatus (Flowering Rush)

Flowering Rush, Grassy Rush, Lily Grass, Water Gladiolus


Butomus umbellatus (Flowering Rush) is an herbaceous perennial with erect or floating, very long, grassy leaves, up to 3 ft. (90 cm) or more. In summer, large umbels of fragrant, rosy-pink flowers, 1 in. wide (2.5 cm), are borne on stiff stems. The delicate blossoms are pollinated by bees, flies, and lepidopterans. They are followed by beaked fruits which split at maturity to release the seeds. Native to Eurasia, Flowering Rush spreads mostly from rhizomes and occurs in wet areas with muddy soil, such as freshwater marshlands, lakes and streams. It can displace native riparian vegetation and is listed as an invasive plant in some areas.

  • Grows up to 1-5 ft. tall (30-150 cm) and 1-2 ft. wide (30-60 cm). Once established in a marsh, populations tend to increase and persist indefinitely.
  • Performs best in full sun in fertile mud at pond margins or in water up to 10 in. deep (25 cm).
  • Excellent choice for moist to wet areas of the garden, water gardens, near ponds and streams.
  • No serious pest or disease issues. Keep an eye out for water lily aphid.
  • Cut back after flowering
  • Propagate by seed sown as soon as ripe or by rhizome division in spring.
  • Native to Eurasia.
  • Find where this species is invasive in the United States.

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Requirements

Hardiness 3 – 11
Heat Zones 5 – 8
Plant Type Aquatic Plants, Perennials
Exposure Full Sun
Season of Interest Summer (Early,Mid,Late)
Height 1' – 5' (30cm – 150cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" (45cm)
Water Needs High
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moisture Retentive, Poorly Drained
Characteristics Showy
Native Plants United Kingdom
Tolerance Wet Soil
Garden Uses Bog Gardens, Ponds and Streams, Water Gardens
Garden Styles Informal and Cottage

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Manfred Ruckszio, Irina Borsuchenko, Shutterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 3 – 11
Heat Zones 5 – 8
Plant Type Aquatic Plants, Perennials
Exposure Full Sun
Season of Interest Summer (Early,Mid,Late)
Height 1' – 5' (30cm – 150cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" (45cm)
Water Needs High
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moisture Retentive, Poorly Drained
Characteristics Showy
Native Plants United Kingdom
Tolerance Wet Soil
Garden Uses Bog Gardens, Ponds and Streams, Water Gardens
Garden Styles Informal and Cottage

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