Delphinium 39summer skies39 a pacific hybrid type of delphinium produces tall spires of lovely sky blue flowers that are perfect for adding height and colour to garden borders traditionally a cottage garden plant they are also a popular choice for a range of garden styles as well as being planted in garden borders delphinium 39summer skies39 can also be planted in an area of perennial flowers grown for the sole purpose of being cut for indoor floral displays they flower in j