1/31/2024 0 Comments Loosestrife seeds![]() ![]() In addition, plant fragments produced by muskrats and by mechanical clipping can rapidly spread through river and lake systems. A single, mature plant can produce more than 2.5 million seeds annually. Plants reproduce primarily by seeds, but also by vegetative cuttings. yard) with growth rates exceeding 1 cm/day (0.4 in/day). ![]() Under natural conditions, seedling densities can approach 10,000-20,000 plants/m 2 (12,000-24,000 plants/sq. Each plant has an average of 30 stems which die in late fall but remain standing through winter. New stems emerge from the perennial roots allowing the plant to establish dense stands within a few years. Purple loosestrife has a vigorous rootstock that serves as a storage organ, providing resources for growth in spring and regrowth if the plant has been damaged from cuttings. Seeds are long-lived and can remain viable even after 20 months of submergence in water. Seeds are commonly dispersed by wind, but are also dispersed in water and mud adhering to aquatic wildlife, livestock, and people. Seeds are dispersed from late summer through the winter. Each plant may contain up to 900 capsules. Seeds: The capsules contain an average of 120 orange, minute seeds (0.06 mg). Each plant may bear as many as 3,000 flowers. The self-incompatible, insect-pollinated flowers bloom from June to September and the flower stalks remain standing through the winter. The calyx tube has hirsute lobes 0.5- 0.8 mm (0.02-0.03 in) long which, along with the bracts, are greenish. Three forms of the species are distinguished based on the length of the style (up to 7 mm) in the flowers. Leaves are lanceolate and up to 10 cm (4 in) long and 1.5 cm (0.6 in) wide with an obtuse or cordate leaf base.įlowers: Purple loosestrife has showy, attractive flowers with 5-7 purple petals (occasionally pink or white) occurring in dense compound, terminal bracted spikes that may be 15-20 cm (6-8 in) high. Leaves: The entire sessile leaves are primarily opposite or in whorls of three without teeth. They may appear woody at base of large plants. Stem: Stems are pubescent and distinctly four-sided. ![]() Established plants have 30 to 50 shoots that form wide-topped crowns and dominate the herbaceous canopy. Height: Purple loosestrife grows 1-3 m (3.0-10.0 ft) tall, with an average height of 1.5 m (5 ft). Also known as Bouquet-violet, it belongs to the Lythraceae (Loosestrife) family. This aggressive invader replaces native vegetation, degrades wildlife habitat, and obstructs natural waterways. Purple loosestrife ( Lythrum salicaria L.) is a wetland perennial that forms large, monotypic stands throughout the temperate regions of the U.S. Southeast Exotic Pest Plant Council Invasive Plant Manual Purple Loosestrife, Lythrum salicaria - Southeast Exotic Pest Plant Council Invasive Plant Manual ![]()
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