Larkspur Blue Spire is another selection of this annual flower the Larkspur. This variety is easy to grow from Larkspur flower seed. This variety is one of the most popular of garden flowers. There are many colors and several flower forms of Larkspur as well as different heights. Professional florists use Larkspur as filler for bouquets. Larkspur dries well keeping its color which makes it popular for creating dried arrangements. Larkspur creates a wonderful backdrop for the flower garden. Blue Spire has many rich, dark blue blooms that are 1″ across. Larkspurs make a wonderful cut flower. Cut when 1/3 of the delicate flowers on the spike are opened. Their vase life is 6 – 8 days.