• Grow several lavender plants together for the best effect.Medioimages/Photodisc/Photodisc/Getty Images
  
  Lavender thrives in well-drained, slightly alkaline soils and full sun. English lavender (Lavandula angustifolia) and lavendin hybrids are hardy to USDA plant hardiness zone 5; treat French and Spanish lavenders as annuals. When selecting plants to grow with lavender, look for plants with similar growing requirements. Choose plants in colors, such as pink, white or yellow, that complement lavender's purple and blue hues. Select plants that are similar in size to lavender, but may offer a contrast of foliage or flower shape.
  
  

Jupiter's Beard

• Jupiter's beard (Centranthus ruber), also known as red valerian, has small, blue-green leaves and a sprawling, airy growth form, making it a nice contrast to the tight, bushy growth of lavender. It produces bright pink, red or white clusters of tiny flowers mid-June through August and self-sows prolifically. It grows 18 to 24 inches high and spreads to 3 feet.
  
  

Purple Coneflower

• Coneflower thrives in full sun.Butterfly and Coneflower image by Alain from Fotolia.com
  
  Purple coneflower (Echinacea purpurea) produces large, daisy-like flowers on single stems from July to September. The 3 to 4 inch wide flowers provide contrast next to the small clusters of flowers produced by lavender. They are white or dark pink with an iridescent center. The foliage lies close to the ground and is insignificant. Coneflowers reach 24 to 36 inches high and spread 3 feet.
  
  

Coreopsis

• Coreopsis (Coreopsis grandiflora) provide a needed punch of color in the lavender perennial garden. Bright yellow, double flowers bloom from June to August on plants that stand 24 inches high. Coreopsis are short-lived, but self-sow prolifically. Deadhead them to promote new flowering.
  
  

Yarrow

• Yarrow grows wild in fields and along roadsides.yarrow behind fence image by Wendy Goubej from Fotolia.com
  
  Many varieties of yarrow (Achillea) are available in peach, yellow, white or red with yellow centers. This native wildflower produces rounded clumps of flowers in tall stalks. The foliage is dark-green and fern-like. Yarrow grows 2 to 4 feet high, depending on the variety, and spreads 2 to 4 feet wide. Some varieties are aggressive and spread quickly.
  
  

Daylily

• Daylilies (Hemerocallis spp.) have large, trumpet-shaped flowers and spear-like clumps of foliage that contrast well with lavender. The flowers may be orange, red, peach or yellow, depending on the variety, and bloom from June to July. The plants spread in clumps and grow 12 to 48 inches high and 2 feet wide. Deadhead the flowers to encourage new blooms.
  
  

Black-eyed Susan

• Cheery black-eyed Susans need little care.black eyed susan image by sharon from Fotolia.com
  
  Black-eyed Susans (Rudbeckia fulgida) provide cheery, bright color to the lavender garden and a profusion of daisy-like flowers. The flowers are deep-yellow with brown to black centers, and bloom from July to August. They stand 18 to 24 inches high in clumps.