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key growing information
How to Grow Perennial Sunflowers From Seed
How to grow perennial sunflowers from seed: starting transplants, direct sowing in warm soil, soil, spacing and dividing, cutting stage and uses.
By Hensley’s Seed Co.
Perennial Sunflowers - Key Growing Information
DAYS TO GERMINATION:
Allow about 14 days at 70°F (21°C).
SOWING:
For transplants, sow 8–10 weeks ahead of the last frost and move seedlings into cell packs or individual containers once the first true leaves show. Harden off and plant out after the last frost. To sow in place, wait until after the last frost, when the soil has reached 70°F (21°C).
LIGHT PREFERENCE:
Full sun.
SOIL REQUIREMENTS:
Grows in almost any soil.
PLANT SPACING:
18–24" apart. Plants spread quickly and need dividing about every third year.
HARDINESS ZONES:
Hardy in Zones 3–9.
HARVEST:
For fresh use, cut when a quarter to a third of the flowers on a stem have opened.
USES:
A cut flower and a fine choice for the back of perennial borders, naturalistic gardens and wildflower plantings.
SCIENTIFIC NAME:
Helianthus maximiliani
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