Control of Canada Thistle in CRP and Other Noncrop Acreage • FNR-436-W. PTTOW! Q: For several years I have had a problem with thistles in the lawn. How to Get Rid of Thistle I seem to have a nice stand of Canadian Thistle in my 2nd year wildflower garden. Canadian Thistle is one tough weed that wants to stay alive and re-grow! This cool season perennial (Zones 2-8), known for its difficulty to kill and its desire to take over your garden completely and totally, is a scourge for gardeners. My yard when I bought the house a had a thistle problem. is an invite-only member network and summit that brings together leaders, from the world’s most innovative companies, along with cultural icons for high level discussions on culture, media and marketing. Thistle – specifically Canada Thistle – appears over a wide area of the U.S. and obviously, Canada (Bull Thistle and Creeping Thistle are closely related). Chemical control with labeled herbicides will drastically help with thistle control. Canada thistle grows on an extensive root system that can go quite deep into the ground, and the plant can grow back from even a small piece of root. The best way to get rid of thistle is to use chemical control where possible. Wild onions (Allium canadense) can be found in many gardens and lawns, and wherever they are found, a frustrated gardener is sure to be found nearby.These difficult to control weeds are the bane of many gardens, but with determination and a little hard work, you can get rid … Started as a few at the corner of the lot, and eventually started to sprout up in a line down the yard (like a tank column). The extensive root system makes it a difficult weed … Killing the Thistle. How to Get Rid of Canada Thistle When starting a Canada thistle control program, it is best to first understand what makes Canada thistle such a difficult weed to control. Figure 1. Thistle plants come from the Asteraceae plant family and include several varieties. Canada thistle grows naturally throughout most of Canada and much of the northern and western United States. They seem to migrate in from the fields nearby. This perennial plant has a large root system that spreads out widely and digs down deep into the soil. It is selective and will kill the plant all the way down to the root. Thistle – specifically Canada Thistle – appears over a wide area of the U.S. and obviously, Canada (Bull Thistle and Creeping Thistle are closely related). The stems of Canada thistle lack the conspicuous spiny wings found on bull thistle (C. vulgare) Before you can get started with removing the thistle from your property, the first thing that you need to know is that there are two common types of thistles, … Some were >1ft in diameter. Here are a few simple things that you can do to get rid of the infestation. Make it too strong and you could kill the grass as well as the weeds. Treating to get rid of thistle. 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