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key growing information
Growing Dianthus (Sweet William/Carnation) From Seed
How to grow sweet William (Dianthus barbatus) from seed: starting transplants, cool growing temperatures, direct sowing, hardiness, cutting stage and pelleted seed.
By Hensley’s Seed Co.
Dianthus (Sweet William/Carnation) - Key Growing Information
DAYS TO GERMINATION:
Expect 7–14 days at 65–72°F (18–22°C).
SOWING:
Transplants are recommended: sow 6–8 weeks before the last frost, pressing the seed lightly into the mix. Move seedlings into cell packs or 3-4" containers 20–25 days after sowing, then harden off and plant out 6–8 weeks after sowing. Grow them cool, at 50–55°F (10–13°C), to keep plants compact and well branched at the base; temperatures above 65°F (18°C), especially at night, give soft growth. Direct sow in early spring while light frost is still possible.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Varies.
PLANT SPACING:
Space plants 6" apart.
HARDINESS ZONES:
Hardy in Zones 6–8, but performs best grown as an annual.
HARVEST:
Cut when 10–20% of the flowers in the cluster are open.
A strong commercial cut flower that also suits gallon-pot production (one plant per pot) and makes a pretty bedding plant.
PELLETED SEED:
Pelleted seed needs evenly moist soil while it germinates. Keep it cool and dry until sowing and use it within a year of purchase.
SCIENTIFIC NAME:
Dianthus spp.
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