![]() ![]() New Hampshire Master Gardener Alumni Association.New Hampshire Master Gardeners Show New Hampshire Master Gardeners submenu.Yard & Garden Show Yard & Garden submenu.North Country Fruit & Vegetable Seminar & Tradeshow.Fruit & Vegetable Crops Show Fruit & Vegetable Crops submenu.Farm & Ranch Stress Assistance Network (FRSAN).Farmer Support Networks Show Farmer Support Networks submenu.Dairy, Livestock & Forage Crops Show Dairy, Livestock & Forage Crops submenu. ![]() Labor & Financial Recordkeeping & Analysis.Agricultural Business Management Show Agricultural Business Management submenu.Agriculture & Gardens Show Agriculture & Gardens submenu.If you need a replacement for your garden, try planting an alternative non-invasive species such as blazing star ( Liatris spp.). Purple loosestrife should never be purchased, planted, or transplanted. Purple loosestrife is also being biologically controlled in some parts of New Hampshire by two species of introduced leaf-eating beetles. Do not spray plants that are growing in or near the water. Selectively spray individuals to avoid killing non-target plants. If you have purple loosestrife on your own property in a dry upland area, it can be controlled with an approved herbicide. Dispose of all plant parts - do not put them on the compost pile. This treatment won’t kill the plants, but it will slow their spread. Plants can also be cut to the ground before they set seed. Cut the flower heads over a bucket or bag to collect seed. Before digging, remove flower heads to prevent spreading any seed inadvertently. Larger older plants are more easily removed with a shovel or digging fork. As plants mature they develop an extensive perennial root system. Hand-pulling is best when plants are young. Small or new infestations can be hand-pulled or dug. The best time to manage purple loosestrife is when it is flowering, because that is when it is easiest to recognize. Purple loosestrife spreads primarily by seed. It is considered a serious threat to these habitats, because once it becomes established, it quickly displaces native species and reduces overall plant and animal diversity. Purple loosestrife is usually found in sunny, wet areas, such as the edges of ponds and lakes, drainage ditches, marshes, and wetlands. Purple loosestrife can be identified by its oppositely arranged, downy, smooth edged leaves along the stem, as well as by its showy, purple flowers that bloom from mid-July through early August. Horticulturists subsequently propagated it as an ornamental bedding plant. Purple loosestrife is a perennial invasive plant that was introduced to North America from Europe via seeds in ships’ ballast. With its striking flowers, purple loosestrife ( Lythrum salicaria) is a beautiful menace in wetland habitats. ![]()
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