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However, Perennial Sow Thistle has extensive light-coloured creeping roots that are easily broken. Perennial and annual Sow Thistle are hard to distinguish. Repeated mowing along roadways and undeveloped properties can control seed production as long as mowing is done before flowering.ģ. Do not till as this will only spread the weed. Roots can go down several feet, so persistent, repeated digging and removal of as much of the root and any seedlings is the best way to keep control of this aggressive plant. Gray seed heads follow and copious amounts of seeds are spread by the wind in late summer. As the plants mature, erect stems form with prickly notched leaves topped by purple flowers that open in mid-summer. Often found in groups since they grow from the spreading root system. Seedlings form in an oval and develop into a basal rosette of spiny irregularly toothed leaves. Canada Thistle is found in home gardens, back lanes, fields and especially along roadways and undeveloped properties. Heavy infestations may require spraying however, use spot spraying rather that general broadcast.Ī perennial that spreads by horizontal root stalks and seeds. This will reduce the number of seeds that germinate, but do not use corn gluten if you want to reseed your lawn. If you know seeds have blown onto your lawn, you can apply corn gluten, a pre-emergent, in early spring. Repeatedly digging out as much of the taproot as possible will weaken young and established plants and may cause their demise. The hollow stalk which supports the flower leaks a sticky white sap when cut. The flower buds form in the middle of the rosette. Seedlings appear in early spring with smooth oval shaped cotyledons and grow into a basal rosette with irregularly toothed leaves. Dandelions can be found almost everywhere and if left unchecked form thick colonies in lawns, parks and along roadways. Perennial WeedsĮasily recognized by its bright yellow flower heads or fluffy gray seed heads, it is a perennial that spreads by seeds and branching taproots. Always follow the instructions and take the necessary safety precautions when using any product even ones listed as “organic” or “natural”. There are more organic products being developed so try those before resorting to the more toxic chemical products. If repeated attempts to eradicate fail and the problem is increasing, it may be time to consider some form of chemical control. This smothering will kill the roots and once the cover is removed the dead plant material can be removed to insure that there is no regrowth. This is where dark sheeting, heavy cardboard or old carpeting is spread over the area and left for several weeks or even months during sunny, dry weather. If dealing with a large area, smothering or solarizing can be used. However, some weeds are very persistent and require repeated digging and discarding of all plant parts. Tilling and hand weeding removes most annual weeds. Using mulches inhibits the growth of some weeds. Making sure your desired plants are healthy and vigorous will impede the growth of weeds. Identifying the plant provides the information required to decide the best control methods.Ĭontrol Methods: Early detection and removal of unwanted plants is the first line of defence.
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Also consider where the plant is most plentiful, is it in sun or shade, dry or moist soil, tilled or compacted soil. As the plant matures you will have flowers and maybe seed pods to examine. It is important to examine leaves, stems and roots at the early stages of growth. Also identification depends on what stage of growth you are dealing with. Identification: Identifying the “weed” can be difficult because many are very similar in appearance. We have also included a listing of plants that are still sold or exchanged as ornamentals, but can be very aggressive and spread easily into neighbouring properties. In Manitoba a listing of noxious weeds and a Tier Level categorizing the severity of infestation can be found on the Government of Manitoba Agriculture website.įor the purpose of this listing of weeds, we have chosen those weeds that are most commonly found on or near public and private gardens. Depending on the level of infestation, governing bodies have developed classifications and noxious weed control laws.
![wild vine with purple flowers wild vine with purple flowers](http://myturksandcaicosblog.com/wp-content/uploads/2009/12/flowerIMG_2352-300x225.jpg)
Weeds are divided into perennial, annual, winter annual and biennial categories. It interferes negatively with the growth of desirable plants, is persistent and difficult to eradicate. Introduction: A definition of a weed is any plant growing in abundant quantities where it is not wanted. By Jeannette Adams, Marilyn Dudek and Teresa Lopata