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key growing information
How to Grow Black-Eyed Susan From Seed (Rudbeckia triloba)
How to grow Rudbeckia triloba from seed: prechilling, transplants or direct sowing, vase life, cutting stage, soil and uses.
By Hensley’s Seed Co.
Rudbeckia triloba - Key Growing Information
DAYS TO GERMINATION:
Allow 7–10 days at 70–75°F (21–24°C); prechilling for 30 days gives the best results.
SOWING:
For transplants, sow 5–7 weeks before planting out, covering seed lightly. For best results, prechill for 30 days by setting the sown flats outdoors or in the refrigerator and keeping them moist. Afterward, move the flats somewhere warm until seedlings emerge. To sow in place, press seed gently into the soil as soon as it can be worked in early spring, or in fall. No pinching needed; plants self-sow.
LIGHT PREFERENCE:
Full sun to partial shade.
PLANT HEIGHT:
Grows about 48–60" tall.
PLANT SPACING:
Space plants 18–24" apart.
HARDINESS ZONES:
Hardy in Zones 3–9.
VASE LIFE:
Lasts 10–14 days. Freshly opened flowers may droop right after cutting but perk up once they rehydrate; blooms open a few days are firmer when cut.
HARVEST:
Cut once flowers are fully open.
SOIL REQUIREMENTS:
Average soil; drought tolerant once established.
USES:
A superb cut flower for beds and borders.
SCIENTIFIC NAME:
Rudbeckia triloba
ALTERNATE NAME:
Brown-eyed Susan
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