Buy dried flower bunches of eryngium flowers, a steely blue thistle, air dried for flower arranging and flower crowns. Each bunch consists of eight to ten branched stems, about 50cm long. Each natural thistle flower is approximately 1 to 3 cm long. Some flowers are more fully developed than others as can be seen in the photos. The variety is Blue Star. Eryngium is popular in floristry for weddings or to add an architectural element to a bouquet or home decor. Being part of the thistle family, eryngiums are popular for Scottish themed events.