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When Does the Flowering Rush Flower?

The flowering rush (Butomus umbellatus) is a non-native aquatic plant that has become an invasive species in areas of the Northern United States. Because it closely resembles native true rush when not in bloom, knowing when it will flower can help identify and eliminate it. It is a very hardy species that often crowds out native plants and interferes with recreation activities such as boating and swimming.

  1. About

    • Flowering rush is a rhizomatous perennial native that requires wet soil and full sun. It does not grow in shade. It is commonly found along the edges of slow moving waterways such as lakes, streams and rivers. It can also be found growing in marshes and ditches. It will not grow in water over nine feet deep.

    History

    • Flowering rush was first found in North America in Quebec in 1897. It wasn't found in the United States until 1918 when it was found in Michigan. It was originally brought over as an ornamental plant and is still sold as such for use in water gardens. A few states, such as Minnesota, Washington, Connecticut and Vermont, have begun to regulate it or have made it illegal to buy or sell flowering rush.

    Identification

    • It is very difficult to tell the flowering rush from non-invasive species when it is not in flower. It has stems that are erect and triangular in cross section. It can grow up to five feet above the water. Leaves are erect, up to 40 inches long and may have twisted tips. The base of the flower stalk may have small, bulb-like sprouts called bulbils. When not in flower, flowering rushes look like bulrushes and true rushes such as the bur-reed (Sparganium spp.).

    Flowers

    • Flowering rushes will only bloom in shallow water. Their bloom time is between June and August. Flowers have three large, white to pink petals about an inch across. The flowers grow in umbrella-shaped clusters. One cluster can have anywhere from 20 to 50 flowers. The flowers ripen into a dark brown fruit about 1/3-inch long.

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