Every year, usually during the first week of March, Longwood Gardens in Kennett Square, Pennsylvania, displays collections of Himalayan Blue Poppies. (Meconopsis betonicifolia ) These poppies are difficult to grow, but some instructions can be found here: How to grow Himalayan Blue Poppy . I love these flowers. They are truly sky blue with delicate and fragile petals. If you see them once they will be forever in your heart.