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Tithonia rotundifolia
species; warm season annual
At‑a‑glance
- Group/Class: species; warm season annual
- Height x spread: 4 to 6 ft (1.2 to 1.8 m) x 2 to 3 ft (0.6 to 0.9 m)
- Bloom window: July to frost (varies by climate)
- Color & flower form: orange to red orange daisylike heads 2 to 3 in (5 to 7.5 cm) across
- Fragrance: 0 none
- USDA hardiness: grown as annual in most of North America; frost tender
- Breeder / Year / Origin: unknown, unknown, Mexico and Central America
- Cut-flower notes: stems are hollow and can be brittle; used as cut flower; handle gently
- Pet safety: unknown
How it differs
- Classic orange to red orange color instead of yellow tones in other species.
- Moderate height fits the back of standard borders.
- Reliable midsummer to frost bloom in temperate gardens.
Strengths
- Heat and drought tolerance in summer conditions.
- High nectar value for butterflies and bees.
- Flowers in average to poor soils.
Care in one minute
Grow in full sun with well drained soil and neutral to slightly acidic pH.
Water to establish; then water deeply but infrequently.
Avoid high nitrogen feeding.
Pinch once at 12 in (30 cm) to branch; stake if exposed.
Watch‑outs
- Stems can be brittle and break in wind.
- Rich soil can cause weak, floppy growth.
- Not frost hardy; tall plants may need staking.
Best uses (tags)
Provenance note
Native to Mexico and Central America. Widely introduced as an ornamental and commonly grown from seed each summer.
References
- NC State Extension Plant Toolbox – Tithonia rotundifolia
- Missouri Botanical Garden Plant Finder – Tithonia rotundifolia
- University of Wisconsin Horticulture – Mexican sunflower profile
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