Maximilian Sunflower. Helianthus maximilianii.	Maximilian Sunflower. Helianthus maximilianii.

Maximilian Sunflower. Helianthus maximilianii, Aster or Sunflower Family ( Asteraceae ), also known as the Composite Family: ( Compositae ), Maximilian Sunflower: Also called; Maximilian's Sunflower. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Maximilian sunflowers are tall perennials unlike other sunflowers which are annuals. Some books place them as annuals. They have one or more stalks and long, narrow, pale green leaves. Helianthus maximilianii produce large bright yellow flowers up to three inches across in a spiral around the stem. This plant grows from one to about ten feet high, but they are usually about four to six feet tall. Maximilian Sunflowers are grazed by cattle and deer. They produce an abundant supply of seeds, which many species of birds find hard to resist. Quick Notes: Height: Up To 4 to 10 feet tall. 3 to 4 feet wide. Flowers: Brilliant yellow, up to about 4 inch wide in clusters at the top of the stems. 10 - 25 yellow petals surrounding a yellow disk. Flowering Time: September to November. Leaves: Gray-green drooping leaves up to 12" long and only 2" wide. Found: The USDA claims it is native of the USA (AL, AR, CA, CO, CT, IA, ID, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NJ, NM, NY, OH, OK, PA, SC, SD, TN, TX, VA, WA, WI, WV, WY). Also native of Canada (AB, BC, MB, ON, QC, SK). Also native of northern Mexico: Baja Norte,Baja California, Chihuahua, Coahuila, Durango, Nuevo Leon, Sonora, Tamaulipas, Zacatecas. Hardiness: USDA Zone 4a: to -34.4 �C (-30 �F) USDA Zone 4b: to -31.6 �C (-25 �F) 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 Light Shade Elevation: 0 - 9,000 feet. Habitat: Seasonally moist ditches or depressions on prairies. Miscellaneous: Flowering Photos Taken April 19, 2008. Arizona-Sonora Desert Museum. Great Xeriscape plant. Can be a perennial.