Buy dried flower bunches of eryngium, a steely blue thistle, air dried for flower arranging and flower crowns. Each small bunch consists of eight or more branched stems, about 40cm long. Each natural thistle flower is approximately 1 to 3cm long on a green stem. 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.