Newly added to the Perennial section. This is a very lovely Delphinium that belongs in the Belladonna group. I've added a Canadian plant source, but they are only available in spring. So if you visit their site now, you will not find it. But you should be able to order from their next catalog.
Also added a UK seed source. The plant is hardy to zone 4b. It does die back to the ground so mark the spot to avoid damaging it. I will add more information in the journal