Bigflower Coreopsis. Coreopsis grandiflora, Aster or Sunflower Family also known as the Composite Family: ( Compositae ), Tickseed: Also Called; Tickseed: Largeflowered Tickseed, Largeflower Tickseed, Tickseed Coreopsis Coreopsis grandiflora 'Early Sunrise'. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Coreopsis grandiflora is a very showy, upright, clump-forming perennial. It grows about 20" - 30" tall with a similar spread. It has simple and lance-shaped leaves up to about 4 inches long. The 'Sunray' variety has dark yellow, double flowerheads, up to about 2 1/2" across, consisting of ray florets with uneven cut margins, and orange yellow disk florets. Tickseed is very attractive to bees, and makes an excelllent cut flower. It is native to central and southeastern U.S. Quick Notes: Height: Up to 20 - 30 inches tall with a similar spread. Flowers: Yellow, flower heads appear at the ends of 12 - 18 inch light green stems. Flowers are double flowerheads, up to 2 1/2" across, consisting of ray florets with uneven cut margins, and orangish-yellow disk florets. Flowering Time: March - May. Sometimes all summer. Leaves: Simple and lance-shaped, to 4 inches long. Found: Coreopsis grandiflora is native to the central and southeastern U.S.A. The USDA claims it is native of the USA (AL, AR, CA, CT, FL, GA, IA, IL, IN, KS, KY, LA, MD, ME, MI, MO, MS, NC, NJ, NM, NY, OH, OK, PA, RI, SC, TN, TX, VA, VT, WI, WV). Also native to Canada (ON, QC). Also found in Northern Mexico: Baja Norte, Chihuahua, Coahuila, Durango, Nuevo Leon, Tamaulipas, & Zacatecas. Hardiness: 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 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 5.6 to 6.0 (acidic) 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) Sun Exposure: Full Sun Elevation: In native elevations Coreopsis grandiflora is normally found at an altitude of 0 to 5,938 feet. Reported to also be found at as high as 10,000 feet in China. Habitat: Original plant from desert gravelly slopes, creosote bush scrub, joshua tree woodland, pinyon-juniper woodland. This is hybrid. An ideal landscape plant in Arizona. Miscellaneous: Flowering Photos Taken May 3, 2008. Glendale, Arizona. This cultivar is usually treated as an annual.

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