I have written this for educational purposes. If in doubt don’t, make certain you know your plants. This is not medical advice and should not be taken as such.
Canadian Thistle has many benefits but is very invasive. I grow it but I keep it isolated and I cut the tops off before the seeds can spread. It is very very difficult to control if you let it go to seed. It can spread through seeds they are similar to dandelion and how they are dispersed. They also can spread through their roots which are very aggressive.
The leaves are edible but you must make sure you get the pricklys off. The roots are edible but if you eat too many they will make you gassy. It helped me a lot with my fight with Lyme. I do enjoy the taste but it is a lot of work getting the jaggy parts off the leaves. The roots have a lot of health benefits also. I like peeling the leaves downward. That removes many of the prickles from the stalk of the young plants, then I light crape it with a knife. Then I eat the stalk, it is a very good tasting vegetable. Has a very sweet taste and is very juicy.
Canadian Thistle has great antiviral and antifungal properties.
Canadian Thistle is a good source of antioxidants.