Posted: 21/05/2014 at 17:41
you're right Dove hemlock and wild carrot are more finely divided as well as those red blotches on the hemlock stems.
The leaves look quire shiny compare to some.
It's not necessarily a weed. Other umbellifers have become quite 'in'. Ammi etc
not suggesting that's what it is, I don't think it is.