The following provides both cultural and chemical control options for common weeds found in Minnesota lawns and landscapes. After this, keep a sharp eye out for any stray sprouts and pull these as soon as you spot them. Weed raking (Water Weed Rake ) or weed cutting ( Weed Razer Pro ) can be difficult because new growth can sprout from seeds and root fragments left behind. 1 Response. First recorded in Washington in 1978 (on King County’s Lake Washington), garden loosestrife also occurs throughout the Northeast and in the western states of Colorado, Montana, and Oregon. Any root scrap results in another year of Canada Thistles, and it’s tough to get them all. Our program staff can provide the property owner or appropriate public agency with site-specific advice on how best to remove it. As we mention above, garden loosestrife can be very difficult to control. As the name implies, its flowers are purple or magenta, appearing clustered in tall, dense spikes. new loosestrife seedling development. Yellow archangel can be managed using specific herbicides. Last, its petals are more pointed than garden loosestrife’s, which are somewhat rounded. A number of herbicides are effective to varying degrees on garden loosestrife. It needs generous watering when first planted and during the droughty days of summer. To use the WeedShear, simply give it a toss out into your lake or pond and let it sink to the bottom. It might be decaying of its roots, infecting leaves, causing yellowish color, mushy spots and … Garden loosestrife was introduced to North America from Europe as an ornamental in the 1900’s and is now naturalized in wetlands and lakeshores in parts of the northwest, midwest and eastern United States and Canada. We’ve since made a big dent in the southeast part of the slough, which we’ve treated almost every year for the past eight years, as the below before and after photos show: Rutherford Slough in 2003. The branched stem has pairs of tapering leaves which end in terminal clusters of deep, yellow-gold flowers. The Eurasian yellow loosestrife (Lysimachia vulgaris), is an erect plant about 2 to 4 feet high. As with garden weeds, control of these plants includes mechanical removal such as digging the plants out by hand, and use of a systemic weedkiller. Covering an infestation of seedlings with a landscaping fabric, black plastic, or cardboard and six inches of mulch can also help to slow growth and seed dispersal, but it won’t kill the roots of mature plants, and it isn’t possible in areas that flood. Remove faded flower stems for a neat appearance. Yellow Loosestrife Diseases. How To Get Rid Of Purple Loosestrife. Good question! I have Gooseneck Loosestrife that has really taken over in my flower garden. Like most loosestrifes that I am familiar with, it has yellow flowers, so the common name Yellow Loosestrife is a bit useless. Garden loosestrife is easiest to identify when it flowers in July and August. (In its native range, garden loosestrife tops out at about 4-5 feet) Its 3-5 inch long, ovate leaves occur in whorls of 3 (sometimes 2 or 4) and have hairy undersides. Aggressive plants can take over even the most meticulous garden. Persistence is the key with getting rid of it. Even if … Control options for common Minnesota lawn and landscape weeds. Despite bearing similar common names Yellow Loosestrife and Purple Loosestrife(which flowers at the same time of year and in the same habitats), are not closely related. If you use this method, be sure to monitor the covering for gaps and check the edges for spreading rhizomes. Characteristics: Height - up to 4 ft Time of bloom - June - July Flower colors - Yellow Propagation - division Transplants - easily . Glyphosate is nonselective; however, selective application techniques allow it to be used effectively with minimum damage to desirable plants. At around 4 ft. tall, it’s also shorter than garden loosestrife. Categories: Program News, Weed Control, Weed Identification, Weed of the Month, Tags: garden loosestrife, King County, loosestrife, Lysimachia punctata, Lysimachia vulgaris, noxious weeds, rivers, Rutherford Slough, Snoqualmie River, Weed Control, wetlands. Watch for rust and leaf spots. Pulling purple loosestrife by hand is easiest when plants are young (up to two years) or in sand. Our program’s Aquatic Weed Specialist, Ben Peterson, is currently collaborating with Washington State University’s Tim Miller on a study about the effectiveness of various herbicides and herbicide combinations on garden loosestrife. First, although it shares habitat and invasive tendencies with purple loosestrife (Lythrum salicaria), it looks very different and is not even related to this other noxious wetland invader. In early to mid-summer, Golden Loosestrife produce abundant spikes of star shaped, golden yellow flowers, tinged in red at the base. The trouble with trying to get rid of Canada Thistle lies in the extensive root structures the invasive weeds extend into the soil. Pests and diseases cause harm to the plant. Yellow Loosestrife Lysimachia punctata. One example is gooseneck loosestrife (Lysimachia clethroides), a terribly invasive plant in its own right. A layer of mulch will help keep soil moist (see below). In 2007, our program received a grant from the Washington Department of Ecology to control garden loosestrife along the Snoqualmie River, thinking the plant had spread into the river from Rutherford Slough. Many plants require only … Shouldn't your neighbors have some say in whether to have this sprouting all over their yards? I have two large well-established Yellow Loosestrife (Lysimachia vulgaris) plants that have been devoured by a small white larvae (perhaps Sawfly Larvae?) We look forward to hearing from you! Often loosestrife is taller than the surrounding vegetation, so you can spray the top of the plant. Once garden loosestrife establishes in an area, it spreads by creeping roots called rhizomes that seem to extend forever and create dense, underground mats that are extremely difficult to remove. And spreads. Lysimachia vulgarisgrows to typically a metre in height and has opposite lanceolate untoothed and almost stalkless leaves in whorls periodically up the stems. Plants should be divided every 2 or 3 years, in the spring or fall, to control their growth. Rutherford Slough, near the Snoqualmie River in Fall City, has been a particular focus area for our program. But we continue to battle the infestation, especially in the northwest half of the slough, where control has been intermittent for external reasons. Yellow loosestrife (Lysimachia punctata) is a more closely related species that can be harder to tell apart from garden loosestrife. It has a creeping root, which persists year after year, and every spring throws up afresh the tall, golden-topped stems, whose flowers are at their best in July and August.