I like this Apiaceae family plant so much, it's getting its own thread. I would never never never had got the name, but fortunately gardener Frankie was there and told me Ammi 'Green Mist', which I was sure I had never heard of. I see that the species name would be A. visnaga. Well, I have already loved this and managed to forget it - I posted this species from UBCBG five years ago at July in the garden, and I like my photos there a lot - it's planted on its own, not mixed into such a great planting as seen here. Presumably the one in the Physick Garden is not the cultivar.