Runyan Lake Inc.

The lake association for the entire community of Runyan Lake
located in Tyrone Township, Livingston County, Michigan.



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Invasive Species - Purple Loosestrife (Lythrum salicaria)



How It Spreads
Purple loosestrife spreads mainly by seed, but it can also spread vegetatively from root or stem segments. A single stalk can produce from 100,000 to 300,000 seeds per year. Seed survival is up to 60-70%, resulting in an extensive seed bank. Mature plants with up to 50 shoots grow over 6 feet high and produce more than two million seeds each year. Germination is restricted to open, wet soils and requires high temperatures, but seeds remain viable in the soil for many years. Even seeds submerged in water can live for approximately 20 months. Most of the seeds fall near the parent plant, but water, animals, boats, and humans can transport the seeds long distances. Vegetative spread through local perturbation is also characteristic of loosestrife; clipped, trampled, or buried stems of established plants may produce shoots and roots.

What You Can Do
Purple Loosestrife can be treated with herbicides (requires MDEQ permit) or be carefully removed to prevent the seeds from spreading.  There are also biological control programs sponsored by Michigan Sea Grant and Michigan State University which provide beetles that consume the flowers of the plant, thus preventing the seeds with cause it to spread.

bulletLearn to recognize Purple Loosestrife.  We have had quantities in the cove and southwest portion of the lake. Click here for a good article.
bulletReport any plants found to Runyan Lake Inc. so we can attempt to remove them.
bulletInspect and carefully remove the plants, at least the tops with flowers, taking care not to drop flowers or seeds into the lake.
bulletRemoved plants should be placed in a plastic trash bag and put out for removal by your refuse company. with your regular trash 
bulletDO NOT BURN THE PLANTS as this will distribute the seeds. 

Runyan Lake Inc. and its members have removed plants from several areas of the lake to control its presence. 



Purple Loosestrife in Michigan (3.5MB)        Wisconsin DNR Loosestrife Brochure        Controlling Purple Loosestrife



Runyan Lake Inc.

PO Box 105

 Fenton, MI  48430-0105, USA

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