Summer flowers

Frontenac, Peter Avenue

What are they, anyone?

Update: Two suggestions so far: 1. Triffids. 2. Acanthus (x 5). 3. Delphinium.

I think, a la Eurovision voting, only Acanthus can now win. Thanks to everyone for the suggestions.

From Mordell Gardens: "Acanthus mollis (or spinosa - need to see leaf to check)". From American friends: They are also called "bear's britches".