Southwestern Cosmos. Cosmos bipinnatus, Aster or Sunflower Family also known as the Composite Family: ( Compositae ), Southwestern Cosmos: Also called; Cosmos, Common Cosmos, Mexican Aster. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Cosmos bipinnatus is a tender annual that has fine feathery foliage, with its pinnate leaves growing to about 10 inches in length. Southwestern Cosmos will grow from about 1 - 7 foot tall depending upon the variety and growing conditions. Mexican aster has beautiful solitary red, white, pink or purple flowers that are about 2 - 3 inches in diameter. Cosmos is a good nectar plant for attracting butterflies into the garden. Quick Notes: Height: Up To 1 to 4 feet tall.Sometimes up to 7 feet tall. 3 to 4 feet wide. Flowers: Two - three inch, solitary red, white, pink or purple flowers. Flowering Time: Late May to November. Leaves: Pinnate, green leaves growing to about 10 inches in length. Found: The USDA claims it is native of the USA (AL, AR, AZ, CA, CO, CT, DE, FL, GA, IL, KS, KY, LA, MA, ME, MI, MN, MO, NC, NH, NM, NY, OH, PA, RI, SC, TN, UT, VA, WI, WV, WY). Also native of Canada (ON, QC). Also native of northern Mexico: Baja Norte,Baja California, Chihuahua, Coahuila, Sonora. Hardiness: USDA Zone 5a: to -28.8 �C (-20 �F) USDA Zone 5b: to -26.1 �C (-15 �F) USDA Zone 6a: to -23.3 �C (-10 �F) USDA Zone 6b: to -20.5 �C (-5 �F) USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) 8.6 to 9.0 (strongly alkaline) Sun Exposure: Sun to Partial Shade Elevation: 0 - 5,000 feet. Habitat: Sandy desert soils, hot, sunny areas, good drainage Miscellaneous: Great Xeriscape plant.

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