Pretty much all thistles are safe foods.
It’s pretty overwhelming at first, I know. But it gets easier as you go along. Something that helped me figure out plants in my area was just searching Google for things like “common weeds of <insert your area here>. Or “plant pests of <insert area>. You can start familarizing yourself with pictures and names you find and eventually they’ll start to look more obvious when you’re outside.
Alberta is a big place! Are you in a city or out in the middle of nowhere? Knowing where you are and what kinds of shops are near to you will help us give suggestions.
Thanks! I am just south of Edmonton a mile and I live on a farm.
Hmm. The only thing I know about Edmonton is that it has very cold winters!
You're on a farm so you probably know what plants have been sprayed and which haven't; that's a good thing.
Are you growing crops or pigs?! If it's crops, you've got problem weeds all over, perhaps? We can probably help identify some of those if you can get a good picture. Post your mystery plants and pictures in their own thread in this forum. Put "Canadians help!" somewhere in the title.