365 Urban Species. #200: Purple Loosestrife

[urbpan]

Photo by urbpan. Location: Leverett Pond, Olmsted Park, Brookline.

Urban species #200: Purple Loosestrife Lythrum salicaria


Handily winning the award for "prettiest scourge ever" is the invasive species poster plant purple loosestrife. An uncommonly attractive marsh plant that forms dense patches of stunning purple blossoms, it prevents native plants from growing. This reduces bird habitat, especially of marsh nesting birds such as rails and red-winged blackbirds. Even native insects are deprived of food when this invader takes over (though a few species of butterflies and bees feed on the flowers' nectar). Native to Eurasia, it now occurs around the world in dozens of far-flung places where growing conditions are suitable. Several attributes account for this plants' success as an invader, and as an urban species. It can tolerate a wide range of moist soil conditions, and is uncommonly hardy, some stands persisting for decades without diminishing. It reproduces both with the production of enormous amounts of seeds (which can be dispersed by birds, not because the birds eat the loosestrife's fruit, but because the tiny thin seeds can cling to their feathers) and through vegetative spread. Trampling, incomplete pulling, and other injuries to the plant only serve to accelerate its spread. Human disturbances to the soil favor the growth of purple loosestrife. Occasionally it can be found growing away from the water in urban areas.











This adventuresome individual is growing out of one of Olmsted's stone bridges over the Muddy River.


This volunteer helps to brighten the garden of a commercial property in western suburb of Maynard.

Comments

Loosestrife

[(Anonymous)]

Purple loosestrife was prohibited from being imported or propagated in Massachusetts as of Jan. 2006. This will not make the millions of wild plants go away, of course, but will perhaps raise more awareness.

Love the plant growing out of the wall!

- Jenn (Invasive Species Weblog)