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key growing information
How to Grow China Aster (Callistephus)
How to grow China aster (Callistephus) from seed: starting transplants, timing for long stems, support, preventing aster yellows, spacing, harvest stage and vase life.
By Hensley’s Seed Co.
China Aster - Key Growing Information
DAYS TO GERMINATION:
Expect 10–14 days at 70–72°F (21–22°C).
SOWING:
Starting transplants is recommended: sow 1/8" deep in 72-cell flats or your usual containers 6–8 weeks before planting out. Heat and shortening days trigger flowering, so plant early to avoid short stems. Direct sow once the soil reaches 65–70°F (18–21°C). Plants need support. Row cover or insect netting keeps out leafhoppers, which spread aster yellows. No pinching needed.
LIGHT PREFERENCE:
Full sun.
PLANT HEIGHT:
Depends on variety.
PLANT SPACING:
6–12" apart.
HARDINESS ZONES:
Grown as an annual.
VASE LIFE:
About 7–10 days.
HARVEST:
For fresh use, cut as the outer ray petals start to open and put stems in water right away. For drying, wait until blooms are fully open.
SOIL REQUIREMENTS:
Fertile soil with good drainage; pH 5.5–7.5 is best.
USES:
Cut flowers and borders.
SCIENTIFIC NAME:
Callistephus chinensis
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