is that Lobelia ??.. someone correct me if im wrong .. and the insect might a Locust Borer... but yours has wings .. so im not to sure .. mayb another type .. but here is this link .. http://www.na.fs.fed.us/spfo/pubs/fidls/locust/locust.htm it might help Marn
Note: Guest comments are moderated. Unregistered's guess was earlier, but cleared after WG's second post.
Forget the bug - eh, the guest. It's the flower we are after. Non fragrant. Flowers in spikes. Up to 3 feet tall. A flowering plant to some, a weed to others.
Not dephinium. The relative sizes of the flowers to the wasps is supposed to provide some hint as to the size of the individual blooms on the inflorescence. I.e., a bit too small for dephinium. If you are really "quick", you might figure out it's common name. Would you like to see the foliage?
Speedwell! Veronica, that is. Maybe Veronica spicata. I thought Echium was a good guess too. Nice shade of blue and a good picture.
Veronica spicata! Dee's got it! This plant does have a weedy tendency, but the blue it has some of the best true blue flowers amongst the perennials in my garden, and it has a rather long flowering season.
Such a short time here on these forums, and I have learnt so much already from the likes of Ron, Daniel, etc.