Evening Star is one of my all-time favorite roses since it was first sold by Jackson & Perkins. I try never to be without it. Fortunately, Roses Unlimited has kept it available. I have grown in here in Zone 5 quite successfully, even without protection some years, but have lost them in severe winters without protection.

Does anyone know  what conditions are necessary to ensure that lavender or bluish peonies and tree peonies  bloom lavender or blue and not pink?  What influences color in peonies?