Mexican Sunflower. Tithonia rotundiflora, Aster or Sunflower Family ( Asteraceae ), also known as the Composite Family: ( Compositae ), Mexican Sunflower: Also called; Tithonia, Bolivian Sunflower, Marigold Tree. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Mexican sunflower is a warm season annual with a stout, spreading habit, growing to 5-6 ft tall and 3-4 ft wide. The leaves are coarse, 3-lobed, 4-10 in long and 2-4 in wide. The leaves and stems are covered with a soft fur. The numerous flower heads are brilliant red-orange, like daisies or zinnias, and about 3 in across. The cultivar, 'Torch', was named as an All America Selection. Dwarf cultivars are also available. Quick Notes: Height: Up To 5 to 6 feet tall. 3 to 4 feet wide. Flowers: Brilliant red-orange, flowers like daisies or zinnias, about 3 in across. Flowering Time: June & October. Leaves: Coarse, 3 - lobed, 4 - 10 in long and 2 - 4 in wide. Covered with a soft fur. Found: There are about 10 species of Tithonia native to Mexico and Central America. The USDA claims Tithonia rotundiflora is native of the USA (FL, LA), USA+ (PR, VI). 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 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �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: 600 - 4,900 feet. Habitat: Sandy desert soils, sunny areas (not hot), good drainage, to 4,900 feet. Miscellaneous: Said not to take heat very well. Many people claim they can't get it to grow very well. Said to take frequent waterings. We doubt that this is a good xeriscape plant, even though many cities claim it is.

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