Guardian Blue Delphinium produces tall dark blue, purple spike blossoms. Part of the Guardian series which were bred for uniform flowers and early blossoms. These re-bloomers will bloom in early to mid-summer and continue if the growing season is long enough and they have been trimmed back in time to grow again. Plant in the back of the garden and stake if not protected from the wind for best results. Guardian Blue Delphinium makes an excellent cutting flower because of their thick stems and are deer resistant.