Your best bet for color from spring to fall comes from annual flowers. However, they need to be replanted every year. If you want to use perennial flowers, plant a mix of long-blooming types with slightly different seasons of bloom. . Some good choices include catmint, reblooming landscape roses, perennial salvia, reblooming daylilies, and ornamental grasses. For specific plans check out the garden plans on our web site at http://www.bhg.com/gardening/plans/.