Idaho in Action / Aquatic Invasive Species / Flowering Rush. Small infestations can be carefully dug up, taking care to leave no bulbils behind. Plants will only produce flowers when situated in shallow water or on dryer sites. Appearance Butomus umbellatus is a perennial which spreads primarily from rhizomes. It is most notable during its flowering stage; July through September. Flowering rush is an aquatic perennial that resembles native grasses. When water levels drop, flowering rush can quickly establish on newly exposed soil. Management. This plant can reach from 1-5 ft. (0.3-1.5 m) in height and can survive in water of up to 9.8 ft. (3 m) deep. It is an aggressive colonizer and can spread by seed, bulbils and rhizome fragments. Flowering rush is a submersed and emergent noxious weed that is expanding in Idaho. Flowering rush is an invasive and perennial semi-aquatic plant. Dense stands can interfere with recreation. It is on the King County list of Regulated Class A Noxious Weeds. It can be difficult to control and research continues on control options. Flowering rush is an aquatic invasive plant that lives along the edges of lakes, streams and wetlands. The pink flower that blooms in June makes it easy to identify at that time. Its pink flowers are borne in an umbel (umbrella-like) at the top of a single flower stalk; the flowers are usually held above the leaves of the plants. The species is originally from Eurasia and was likely introduced as an ornamental garden plant. Flowering-rush is a Class A Noxious Weed in Washington due to its limited distribution in the state and the potential for significant impact to state resources. The Flowering Rush Invasive Species What is the Flowering Rush? Flowering rush is a prohibited invasive species. It is a perennial plant that grows to a height of 3-5 feet. Flowering rush (Butomus umbellatus) resembles a large sedge, with upright foliage that grows in shallow water, though it may also grow submerged.Its leaves have a triangular cross-section with a twist toward the tip. It was first found in the St. Lawrence river in 1897 and since then has spread across southern Canada. The more obvious, emersed, form has “grassy,” erect leaves. Flowering rush plants grow from fleshy rhizomes; plants occur as submersed plants and as emersed plants in marshes and shorelines. Butomus umbellatus, or flowering rush, is a non-native perennial that was introduced from Eurasia in the late 1800’s as a garden plant.Popular for its showy umbrella of petite, pink flowers, since its introduction to North America, this “garden” species has become an invasive and is listed on Vermont and many other states noxious weed lists. flowering rush Management. Invasive Species Management *cut off new plants that may be grow *don spread the bulbs *do not shake or mis handle Scientific name and Physical Appearance * Butomus Umbellatous *Grow in a shape of a umbrella *whitish Flowers grow in an umbrella shaped cluster. It is illegal to possess, import, purchase, transport, or introduce these species (including hybrids or cultivars) except under a permit or statutory exemption. It can crowd out native plants, reduce open water habitat for some trout and shelters invasive fish species. For more information see Noxious Weed Lists and Laws. It forms dense growth and causes significant problems for boating and irrigation systems. The easiest way to identify it is by the flowers, which are light pink with 6 … Flowering rush is an invasive aquatic plant in the northeast U.S. and has a limited distribution Washington. This aquatic plant invades along the margins of slow moving waterways. 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