It can grow up to 120 cm tall. Run a sprinkler or drip system for 20 minutes to a half hour every 5 to 7 days when rainfall is sparse. Don't let the attractive persistent flowers fool you--this one is not an asset to New England. Linda in Alabama. A very aggressive invader of sunny wetlands, purple loosestrife displaces native species and reduces plant and animal diversity. Purple loosestrife (Lythrum salicaria) is a striking native plant with tall spikes of purple flowers from June-September. So it is not surprising that the general public's response upon seeing purple loosestrife flowers tends to be positive, which infuriates conservationists to no end. Watering Loosestrife Purple loosestrife likes moist soil and is even at home in soggy, poorly drained areas. The plant will grow in rich, marshy areas. The stems are reddish-purple or red to purple and square in cross-section. John Everett Millais painted its magenta sprays on the riverbank in his picture of the drowning Ophelia. Description. Return to Content. Purple loosestrife, a regulated Class B noxious weed, is a 6-10-foot-tall perennial that grows on lakes and waterways throughout King County. Posted on December 2, 2020 December 2, 2020 Purple Loosestrife ( Lythrum Salicaria) Purple Loosestrife is a very colourful flower which will send up spires of reddish-purple flowers from June though to August. By streams,rivers and lakes. This striking perennial can reach heights of nearly two metres! Washington, DC: U.S. Dept. Purple loosestrife has woody, strong taproot with several fibrous, lateral roots which provide stability of the plant and ensure constant supply with nutrients from the soil. Simple, smooth-edged leaves grow opposite or whorled on stiff, 4-6-sided stems. Habitat. As you can see from my picture, purple loosestrife flowers are real lookers: growing en masse, these marsh plants form a veritable sea of color. Other names of Purple loosestrife include Spiked loosestrife and purple lythrum, They can gorw up to 1-2 meters tall forming Clonal colonies, can be found in ditches, wet meadows, marshes and along side lakes and ponds. Facts. Soak the soil down several inches. Each plant has … purple loosestrife RHS Plant Shop from £6.99 Sold by 33 nurseries. Purple loosestrife is one of Britain's most beautiful flowers. facts about purple loosestrife. Neutral: On May 2, 2002, Lilith from Durham, United Kingdom (Zone 8a) wrote: An elegant plant with tall spikes of purple flowers. They are pollinated by long-tongues insects including bees and butterflies. Lythrum salicaria is a herbaceous perennial plant, that can grow 1–2 m tall, forming clonal colonies 1.5 m or more in width with numerous erect stems growing from a single woody root mass. It needs generous watering when first planted and during the droughty days of summer. 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