Each flower has five to seven petals arising from a cylindrical green tube. Under optimum conditions, a small isolated group of purple loosestrife plants can spread to cover aquatic sites in just one growing season Figure 3.
As the New England and mid-Atlantic canal systems were built, and settlers cleared forests, drained wetlands, and disturbed soil, purple loosestrife spread inland. Blooms from June through September and grows 2 to 3 feet tall and wide. This also provides an opportunity for seeds present in the soil to sprout.
The plant was present as seed and propagules in the sand and shale that was used to give weight and stability to trans-Atlantic sailing vessels. Annals of Botany Fennici: Finally, cut the stems at the ground to inhibit growth.
July to September; small, purplish-pink with five to seven petals, clustered in the axils of reduced leaves, forming long dense terminal spikes inches long. It is also sold commercially for perennial gardens. Chemical control is used in the United States to control purple loosestrife near or in water, however, as ofno herbicide has been approved for this type of application in Canada.
The Great Lakes Entomologist. Furthermore, purple loosestrife can alter habitat for the federally listed bog turtle. Wetlands — Audubon Society Nature Guide.
As tiny as grains of sand, seeds are easily spread by water, wind, wildlife and humans. The eggs hatch in late-June and July and larvae feed on both leaves and flowers before pupating and over-wintering as adults.
However, the use of specially selected insects that feed on purple loosestrife is being studied to determine the effectiveness of this method for long-term control in these higher density areas.
Purple loosestrife can be found in variety of wetland habitats including freshwater tidal and non-tidal marshes, river banks, ditches, wet meadows, and edges of ponds and reservoirs. This fact sheet has been prepared by The Nature Conservancy.
Waterfowl, especially ducks, avoid wetlands that have become dominated with purple loosestrife. The aerial shoots die in the fall and new shoots arise the following spring from buds at the top of the root crown.
Journal of Economic Entomology. The Challenge Many organizations throughout North America have taken action to control the spread of purple loosestrife. These insects overwinter as adults and lay eggs in early June in North Dakota.
For additional information about Purple Loosestrife, see Purple Loosestrife. However, the cost of controlling it in natural wetlands and navigable waters soars into the millions. Each mature plant can produce up to 2. Environmental Toxicology and Chemistry.
Purple loosestrife was added to the North Dakota Noxious Weed list in after it was found on 37 acres in 11 counties.
Purple loosestrife grows well in full sun; in shaded conditions it may be smaller in stature or have fewer blossoms. Guidelines for Purple Loosestrife Control: Seedling Establishment Emery, S. Purple loosestrife is listed as a noxious weed in 12 other states, where its importation and distribution is prohibited.The leaves of purple loosestrife start out with lance-shaped leaves, but can become very variable in shape as the plant grows.
It has a woody root that can have from stems coming from it. Purple loosestrife has a square, woody stem and opposite leaves. Purple loosestrife also ranked # 2 on The Nature Conservancy weed survey of most troublesome weeds in wildlands for A.
Taxonomy Family: Lythraceae- Loosestrife.
nutrient-deficient conditions, the root/shoot ratio increased and provided purple loosestrife with a competitive advantage over the native species. Purple loosestrife is a very hardy perennial which can rapidly degrade wetlands, diminishing their value for wildlife habitat. Wetlands are the most biologically diverse, productive component of our ecosystem.
This can lead to a reduction in plant diversity, which reduces habitat value to wildlife. Other Common Names: Purple lythrum, rainbow weed, salicaria, spiked loosestrife MORE INFORMATION.
A very aggressive invader of sunny wetlands, purple loosestrife displaces native species and reduces plant and animal diversity. Don't let the attractive persistent flowers fool you--this one is not an asset to New England.Download