Peonies are gorgeous, but it takes some 5 years before they flower! But once they start flowering, they will do so every year, even in heavy clay as my garden has. Even my peony trees flower. The first one after 5 years, the second after 7, the third had its button frozen of and the fourth disappeared. They do seem to like bad weather. In all the years I only had the luck to see them flowering for more than a week (in 2003). For the moment, they are waiting to open their flowers.... when it will start raining again.
PS. The foliage stays until september in my garden...