I bought new black soil and put it in my garden. This weed came through a lot. I assume it was seeds in the soil so I'm unsure if it's native here but I'm in Ontario, Canada. I pulled some without gloves and it hurt BAD. I've pulled raspberries and other prickly plants and they only hurt for a couple seconds where as thing hurt for around 24 hours. It was like i got stung by an insect. There are very small prickles on the stem. WHAT IS IT???