Sue tells me that, whilst the plant/weed shown in the first image below looks like a stinging nettle, it isn’t and you would not be stung if you touched it. I will not be testing this hypothesis. If it looks like a stinging nettle, then it will sting you. I apply the same logic to snakes. If it is a snake, it is poisonous!
For comparison purposes, the image at the bottom of this post is a stinging nettle.