• Autumn crocus blooms from bulbs.Anna Yu/Photodisc/Getty Images
  
  Southern Oregon lies within USDA Hardiness Zones 5 though 8. The end of the summer in these zones varies from region to region. The end of August marks the end the summer growing season for zone 5, while zones 6 and 7 have extended summers until mid-September. Summer in zone 8 lasts until the end of September. A wide variety of flowers, hardy to all of the above zones, are available for end-of-summer planting in southern Oregon. Check with a local gardening center for more information on planting dates and specific recommendations for local flower gardening.
  
  

Autumn Crocus

• Autumn crocus, also known as meadow saffron, blooms in September and is typically planted at the end of summer. This crocus blooms from bulbs and is hardy to zones 4 through 8. Delicate, lavender-colored flowers shaped like a large champagne glass distinguish this flower as a centerpiece in any flower garden. Autumn crocus reaches heights around 1 foot, with flowers measuring around 2 inches. A wide variety of sun and soil conditions are suitable for growing autumn crocus, making this an adaptable flower for many home gardens and landscapes. There are no known pests, although it is worth noting that the fruit and flower are poisonous if ingested.
  
  

Marigolds

• Marigolds are common throughout the United States in all regions. They do well in zones 1 through 11, blooming from May until October or until the first frost hit's a region. Southern Oregon gardeners appreciate the wide variety of colors to choose from including yellow, bronze, mahogany, creamy white and orange. Marigolds are known to attract hummingbirds and butterflies, a delightful addition to any landscape or garden. Their height ranges from 1 to 4 feet high, and flowers are typically 2 to 4 inches wide. Marigolds thrive in full sun exposure in moist, well-draining soils. They are commonly used as decorative border flowers and are often grown in containers. If planted in shade, botrytis grey mold may affect the plant, a result of too much moisture.
  
  

New York Aster

• The New York aster, also known as the Michaelmas daisy, does well in zones 4 though 8, with typical bloom times from September through October. This perennial flower produces purple blooms in various shades with bright yellow centers measuring 1 inch wide. New York aster tolerates a light frost, but typically is spent after the second hard frost of the season. Plant in full-sun areas in well-draining soils for best results.