Swamp loosestrife ( Decodon verticillatus) arches out from shorelines, has mostly whorled leaves and flowers in well-separated leaf axils. alatum) is found in moist prairies and wet meadows has winged, square stems, solitary flowers in separated leaf axils, paired lower leaves and alternate upper leaves. Similar species: Garden yellow loosestrife ( Lysimachia vulgaris) is a non-native, wetland garden escapee with yellow flowers. Stems: Green, sometimes tinged purple, stiff, erect, and generally four-sided (older stems, five or six-sided). Roots: Large woody taproot and many side roots. Seeds are viable for at least seven years. Mature plants with many stems can produce two million seeds. Purple loosestrife (Lythrum salicaria) Description: This species is restricted under Michigan law attractive but persistent weed spreads vigorously in moist. A single stem can produce 100,000-300,000 seeds per year. Plants can bloom the first year after seeds germinate.įruits & seeds: Capsules start bursting open from the bottom of the inflorescence upwards from July through October, often while still flowering above. Blooms from the bottom of the flower spike to the top from late June to September. Usually opposite and rotated 90 degrees from those below but are sometimes whorled.įlowers: Closely attached to the stem with five to six pink-rose colored petals. Send us feedback.Leaves: Simple, lance-shaped and do not have petioles. Distribution: Purple loosestrife has been introduced to every state except Florida. It prefers full sun, but can tolerate shade. While seeds can germinate in water, establishment is much more successful in moist substrate that’s not flooded. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'purple loosestrife.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Habitat: Purple loosestrife thrives along roadsides and in wetlands. 2020 The park is currently fighting against invasives like phragmites, hybrid cattail, buckthorn, Japanese knotweed and even wetland species like purple loosestrife. 2020 Purple loosestrife, an invasive flowering plant, is sprouting up - a problem that Rothman said will be resolved by galerucella beetles that were released in the area in the 1990s and that eat purple loosestrife.Īnna Liz Nichols, Star Tribune, 8 Aug. Megan Hughes, Better Homes & Gardens, 25 Aug. 2020 Instead: For a long-lasting punch of purple in the garden, plant native purple coneflower or blazing star instead of purple loosestrife. John’s-wort, which were once rampant.īarry Estabrook, WSJ, 9 Oct. 2021 In the United States, beetles brought in from Europe now suppress purple loosestrife and St. 2022 These purple flowers resemble purple loosestrife, an invasive species that grows in wet areas and ditches.Ĭhelsey Lewis, Milwaukee Journal Sentinel, 19 Aug. 2021 Carpets of bright-green grass blanketed the glassy surface of the water, accented here and there by clusters of purple loosestrife, a spiky invasive plant, as an aluminum skiff glided silently over the water. 2022 But beware of invasive plants in the region, such as purple loosestrife, autumn olive, Norway maple, tree of heaven and kudzu vines. Megan Hughes, Better Homes & Gardens, 30 Sep. Recent Examples on the Web Instead: For a long-lasting punch of purple in the garden, plant native purple coneflower or blazing star instead of purple loosestrife.
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