Red/Orange Flowers

• Yarrow, a favorite of butterflies, is a mound-forming plant with flat red flower clusters. Butterfly weed also attracts winged visitors, and is bright orange. Sedum forms flat red clusters as well in fall perennial gardens.
  
  

Yellow Flowers

• Rudbeckia is also known as black-eyed Susan; its blooms extend from summer into fall. Sneezeweed is tall and well-placed at the back of a perennial border. Coreopsis forms airy stems topped with daisy-shaped flowers, and attracts bees and other beneficial garden visitors. Forsythia is a blooming shrub; its yellow flowers herald the arrival of spring.
  
  

Blue/Purple Flowers

• Grape hyacinth is one of the first flowers of spring to push up from the ground. Anise hyssop smells like licorice and is a magnet for bees and hummingbirds. Rocky mountain columbine boasts unusual purple blossoms during its spring flowering period.
  
  

Pink Flowers

• Dianthus forms low-growing clumps of serrated-edge flowers. Sea thrift, true to its name, is well-suited to seaside gardens. Hollyhock has ruffled blossoms on tall, stiff stems for the cottage garden. New England aster brings a surprise splash of pink to a fall perennial garden.