One thing too. You will need to burn them now just to keep them from going to seed. Then try to hit them as late in the fall as you can. IF you can hit them about a week or two before the first killing frost you will really work on the root system.
Right now the plant is not storing that many nutrients in the roots. It is focusing the energy to the reproductive parts of the plant. Once it blooms and goes to seed then they start to store nutrients in the root system. This is the time to hit them with a systemic herbicide. You will get a much better long term control this way.
Also you will never get full control of Canadian thistles in one year with anything that allows anything else to grow. They are a tough weed to control as they can reproduce form the root system, tuber, and seed. So the second and third year application is usually getting "new" regrowth.
BE glad your trying this now. There are several good herbicides that really work controlling them now. I rented a farm years ago (early 1980s) that the prior owner had allowed them to get totally out of control. There where spots as big as an acre that where solid thistles. I farmed that farm ten crop years. I sprayed them with RR, 2-4d, and several other chemicals of the day. I burnt them, I mowed them, I deep tilled the bad spots. I even pastured some hogs in one bad area to see if they would root out the tubers. When the farm went into the CRP program it still had about half the thistles I had started with. I never did get the one bad spot totally killed off at that time. I took care of it for the owners after they entered it into the CRP program. We just mowed the bad spots so they never got to go to seed. It DID NOT kill them. So the fellows saying three years of mowing will kill them is not right in real bad infestations. We finally got them when Grazon came out. It took 3-4 years of spraying them to get them 90% under control. There still are seeds that come up in different spots on that farm. It is still in the CRP program.
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