Since investigating the mystery plant in my garden, I've learnt to recognise hogweed and spotted lots of the common kind growing by the roadside near here. As well as being able to harvest it next year, it should also help with identifying my mystery plant. I was fairly sure it was hogweed, but couldn't tell whether it's giant or common. One feature that would help would be the flowers. Both have
umbrellatype flowers, but the shape differs, so if I examine the flowers of my mystery plant carefully and compare it with those by the roadside, maybe I can tell whether it's giant hogweed or not.
My mystery plant is now flowering. Here it is:
Let's take a close look at one of those flower heads:
Hmm, that would appear to be not hogweed. It's not even an umbellifer! Right, back to square one, then. Any ideas on ID of a plant that has leaves like giant hogweed and flowers like round teasels? It's currently about five feet tall.