Buddleia, or Butterfly bush, is a flowering shrub that produces clusters of nectar-rich flowers all summer long. perennial in Zones 5-10, it dies back to the ground in severe winters, only to return bigger in spring. Most varieties grow 3- 6' tall, dwarf forms to 2' tall. Flowers can be shades of purple, blue, yellow, pink, lavender, white, red. Plant them in a sunny spot. Butterflies come in droves!