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Scientific: Tithonia diversifolia
Common: Mexican sunflower, tree marigold, Mexican tournesol, Bolivian sunflower
Family: Asteraceae
Origin: Eastern Mexico and central America (naturalized pan-tropically around the world).

Pronounciation: Ti-THON-ee-a die-ver-sa-FO-lee-a

Hardiness zones
USDA 9-11

Landscape Use: Mexican sun flower is a great warm season accent plant for a large garden border.

Form & Character: Irregularly rounded, but with enough control to not call it sprawling, bright and cheerful, semi-tropical.

Growth Habit: Evergreen, mostly herbaceous, short-lived perennial, upright and sprawling to 5 feet in height with an equal or greater spread.

Foliage/Texture: Large bright green leaves with 2 to 4 deep clefts, margins with a dull serration, 3 prominent leaf veins; medium texture.

Flowers & Fruits: Perfect ray flowers of generally 15 petals grown profusely on short peduncles of less than inches long; fruits inconspicuous.

Seasonal Color: Golden yellow flowser blooms throughout most of the year, more heavily in spring and fall.

Temperature: Freeze intolerant, also struggles is air temperatures are above 110oF.

Light: Full sun

Soil: Tolerant, except needs good drainage.

Watering: In Phoenix, irrigate frequently and deeply especially during summer to maintain robust appearance.

Pruning: Lightly head back in the summer or fall to re-stimulate flowering.

Propagation: Seed

Disease and Pests: None

Additional comments: Mexican sun flower is a bright and cheerful herbaceous shrub for a large, informal flower border. Mexican sunflower attracts bees, butterflies and/or birds.