Purple loosestrife is a marsh plant v showy violet flowers arranged on flower spikes.

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Leaves and also Stem

Leaves space lance-shaped through smooth edges and grow up to 4 inches long. They room usually arranged in pairs opposite each various other on the stem, and rotated 90 levels from the pair below. Leaves sometimes show up whorled (radiating out from a solitary point) roughly the stem. A recognizable feature is the square-shaped stem, i m sorry is generally 4 to six-sided. A single plant is made up of many woody stems.


Individual flowers have 5 or 6 pink-purple petals surrounding small, yellow centers. Single flowers consist of flower spikes, which deserve to be as much as one foot tall. Flowers bloom from at an early stage July through September.


Purple loosestrife spreads mostly by seeds. When flowers autumn off, capsules containing countless tiny seeds show up in their place. Relying on location, plants may go come seed as early as so late July. Each mature plant can develop up to 2.7 million seed annually. Together tiny as grains that sand, seeds are conveniently spread by water, wind, wildlife and also humans. Germination can happen the adhering to season, but seeds can likewise lay dormant for number of years prior to sprouting.


Purple loosestrife produces thick, woody roots. On mature plants, roots are extensive and also can send the end 30 come 50 shoots, producing a dense web. Piece of the roots and stem fragments can also produce brand-new plants.


Purple loosestrife is a perennial plant discovered rooted in a variety of wet soil habitats. The can prosper in a couple feet the water or on dried shore near the water line. It is frequently found in roadside ditches. Plants variety from 2 to 6 feet tall, v several half to one foot long flower stalks top top a solitary plant. Tree bloom from at an early stage July to September, and also then walk to seed.

Origin and Spread

Purple loosestrife is aboriginal to Europe and also Asia. The types was unintentionally introduced to the unified centregalilee.coms’ an excellent Lakes through contaminated solid cargo ship ballast and through the deliberate importation of seeds. The very first discovery in the United centregalilee.coms was in Lake Ontario in 1869. Violet loosestrife was sold and planted for decades as a decorative ornamental plant. However, as result of its an adverse impacts on indigenous plants and also its ability to escape indigenous cultivation, violet loosestrife is illegal to sell in most centregalilee.coms.

Don"t it is in fooled by these look-alikes

It looks comparable to plenty of native, useful wetland plants discovered in Minnesota shoreland areas and also wetlands.


Regulatory Classification

Purple loosestrife (Lythrum salicaria, L. Virgatum and any combination thereof) is detailed as a MDA prohibition Noxious Weed (Control List) and a banned invasive species in Minnesota, which method it is unlawful (a misdemeanor) to possess, import, purchase, move or introduce this varieties except under a allow for disposal, control, research or education.

Threat to Minnesota Waters

Invasive types cause recreational, economic and also ecological damage—changing just how residents and also visitors use and enjoy Minnesota waters.

Purple loosestrife impacts:

Dense growth along shoreland locations makes it difficult to accessibility open water.Overtakes habitat and outcompetes indigenous aquatic plants, possibly lowering diversity.Provides unsuitable shelter, food, and nesting habitat for native animals.Dense source systems change the hydrology that wetlands.

What you need to do

People spread out purple loosestrife primarily through the activity of water-related equipment and also uninformed release of garden plants. The plant produces millions of tiny seeds in shoreland areas. Seeds can be covert in mud and also debris, and can stick to boots, waders, and also other fishing and hunting gear. Roadside maintenance equipment can additionally spread this plant and its seeds.

Whether or no a lake is provided as infested, Minnesota regulation requires water recreationists to:

Clean watercraft of all aquatic plants and prohibited invasive species.Drain every water through removing drainpipe plugs and also keeping lock out during transport.Dispose of undesirable bait in the trash.Dry docks, lifts, swim rafts and also other tools for at the very least 21 days before placing tools into another water body.

Follow the “Play, Clean, Go” ideal management techniques to prevent the spread out through terrestrial systems.

Report brand-new occurrences of purple loosestrife come the centregalilee.com automatically by contacting your centregalilee.com Invasive species Specialist or log in and also submit a report through EDDMapS Midwest.

Control Methods

Management the invasive aquatic plants involving either mechanical removal of plants or application of herbicides to public waters needs a permit from the centregalilee.com. Talk to a centregalilee.com professional for an ext information.

Mechanical control can be done using hand-held equipment like a shovel or weed puller, yet is labor intensive for large stands. Hand removed is encourage when handling individual tree or very little stands. Mowing is no recommended together plants will most likely re-sprout and seeds may be spread.

Herbicide control deserve to be done using glyphosate herbicides. One aquatic herbicide formulation is forced if therapy is to be conducted on or near water.

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Biological control can be done using four species of beetles which are well-established biological control agents in Minnesota. These beetles solely eat purple loosestrife, and are a great control choice if the stand of purple loosestrife is at least one acre in dimension or larger. Organic control insects released in between 1992 and 2002 have developed reproducing populations at much more than 90% that the relax sites visited. The permanent objective of biological control is to mitigate the diversity of purple loosestrife in swamp habitats and, if effective, will minimize its impacts on indigenous wetland flora and also fauna. Speak to your local invasive species specialist if you are interested in collecting and also releasing beetles in ~ a site. The finest time to collect beetles for organic control is in late may or at an early stage June.