Purple Loosestrife
Purple loosestrife (Lythrum salicaria) is a restricted species in Michigan. It can grow 4-10 feet tall with opposite leaves. It is common in roadsides and wetlands. Magenta flower spikes bloom for most of summer with 5-7 petals per flower.
Environmental Effects
A single plant can produce a million seeds in one season. Dense thickets can form and suffocate native species. This reduces plant diversity and value to wildlife.
Treatments
There are multiple treatment options for invasive purple loosestrife. These include both chemical and non-chemical options
NON-CHEMICAL CONTROL METHOD
Digging/ hand pulling: small easily accessible patches can be hand pulled. Be sure to remove as much of the root system as possible, otherwise resprouts are possible. Place plant material in trash bags and dispose of in the landfill.
CHEMICAL CONTROL METHOD
Foliar Spraying: herbicide is sprayed directly onto the foliage of the plant. This can be used to treat large patches, often done by contractors. This method should be carried out between the beginning of July and end of August. Note: a permit may be required for treatment.