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key growing information
Growing Branching Sunflowers From Seed
How to grow branching sunflowers for cutting: sowing direct or in cells, pinching for longer stems, succession sowing, spacing, soil and harvest stage.
By Hensley’s Seed Co.
Branching Sunflowers - Key Growing Information
DAYS TO GERMINATION:
Seedlings emerge in about 7–14 days at 70–75°F (21–24°C).
SOWING:
Sowing in place is recommended: plant ½" deep after the last frost. For transplants, sow into 50- to 72-cell flats 2–3 weeks before planting out. Sunflowers resent root disturbance, but starting the first planting indoors is a good way to get an early cut. Pinch branching types to encourage more side branches and longer stems. Sow again every 2–3 weeks, or grow several varieties with different timing, to keep flowers coming.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Depends on variety.
PLANT SPACING:
18–24" apart.
HARDINESS ZONES:
Grown as an annual.
HARVEST:
Depending on your market and how you'll use them, cut while still tight as color first shows, or wait until nearly open. For drying, let flowers open fully, then hang them or dry them in silica gel.
SOIL REQUIREMENTS:
Light soil with good drainage. Too much nitrogen can make plants overly lush and cause misshapen flowers.
USES:
A first-class cut flower. Single-stem sunflowers also make a dependable garden show, but keep in mind that each plant produces just one bloom.
NOTES:
Spacing, temperature, soil and day length all influence flower size and stem thickness. For early- and late-season crops, choose day-neutral varieties or those listed as blooming under short days.
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