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key growing information
How to Grow Tall (Single Stem) Sunflowers
How to grow tall single-stem sunflowers for cutting: direct sowing or early transplants, no pinching, succession sowing, harvest stages, soil, spacing and day length.
By Hensley’s Seed Co.
Tall Sunflowers - Key Growing Information
DAYS TO GERMINATION:
Seedlings appear in 7–14 days at 70–75°F (21–24°C).
SOWING:
Sowing in place is recommended, ½" deep after the last frost. For transplants, sow into 72- to 50-cell flats 2–3 weeks before planting out; sunflowers dislike root disturbance, but starting the first crop indoors is a good way to get extra-early blooms. Don't pinch, as pinched single-stem types give poor blooms or none at all. For a steady harvest, sow every 1–2 weeks and/or grow several varieties with different days to maturity.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Varies.
PLANT SPACING:
Space plants 4–6" apart.
HARDINESS ZONES:
Grown as an annual.
HARVEST:
Cut tight when color first shows, or nearly fully open, depending on your market and use. For drying, cut fully open and hang or use silica gel.
SOIL REQUIREMENTS:
Light soil with good drainage. Too much nitrogen can make plants overly vigorous with misshapen flowers.
NOTES:
Spacing, temperature, soil and day length together determine flower size and stem thickness. For early and late crops, choose day-neutral varieties or those noted to flower well in short days.
USES:
A superb cut flower, and great in the garden.
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