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Cut flowers1 variety
Mexican Sunflower
Tithonia rotundifoliaTall heat- and drought-tolerant annual with orange-red flowers that draw butterflies and hummingbirds.
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Days to maturity
80–90 daysDays to germ.
8–10 daysSpacing
12 inHeight
48–60 inSun
SunHow we grow it
Germination
- Days to germ.
- 8–10 d
- Depth
- 0.5 in
Culture
- Days to maturity
- 80–90 d
- Spacing
- 12 in
- Height
- 48–60 in
- Sun
- Sun
- Frost
- tender
Harvest
Timing · Zone 5a
JanFebMarAprMayJunJulAugSepOctNovDec
Sow indoorsApr 9
Outdoor / directMay 21 – Jun 18
Windows are anchored to an average last frost of May 21 (1 year in 10 as early as Apr 29, as late as Jun 2) and an average first frost of Sep 18 (1 year in 10 as early as Sep 6, as late as Oct 8). In a late or early year, slide them with it.
Compare in the calendarTrials
Every Mexican Sunflower sowingSeed sources, counts, ratings, and the observations kept against each one.Mexican Sunflower trials