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key growing information
Growing Mexican Sunflower (Tithonia) from Seed
How to grow tithonia (Mexican sunflower) from seed: direct sowing in warm soil, light for germination, transplants, cutting and conditioning, soil and uses.
By Hensley’s Seed Co.
Tithonia (Mexican Sunflower) - Key Growing Information
DAYS TO GERMINATION:
Seedlings appear in 7–14 days at 70–85°F (21–29°C).
SOWING:
Sowing in place is recommended, once the soil has warmed into the 70–85°F (21–29°C) range. Cover the seed only barely, since it needs light to germinate. For transplants, sow 6 weeks before planting out. Copes with poor soil.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Grows about 60–72" tall.
PLANT SPACING:
Space plants 12–24" apart.
HARDINESS ZONES:
Grown as an annual.
HARVEST:
Cut when flowers are 90–100% open, then condition the stems for several hours in deep, warm water. Deadheading extends the bloom season.SOIL REQUIREMENTS: Well-drained fertile loam or sandy soil; it copes with poor ground too. Too much nitrogen gives tall plants with few flowers.
USES:
A fresh cut flower. Tall types suit cutting or the back of beds and borders. Fast-growing and handsome, tithonia makes a great annual summer hedge, though it doesn't flower until late summer.
SCIENTIFIC NAME:
Tithonia rotundifolia
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