Gaillardia Seeds - Mesa Yellow84 91 days. Mesa Yellow seeds grow one of summer's brightest and most celebrated blooms, vigorous 12 18 tall gaillardias with eye catching 3 4 heads of golden yellow. Mesa Yellow is a 2010 AAS and Fleuroselect Gold Medal Winner for its dazzling yellow heads that promise to keep the butterflies coming back all season. Mesa Yellow seeds mature in as early as 84 days and make a quick and fun grow for novice gardeners to try out in the back of a garden.