About of the macrocephalic centaury
The common knapweed produces large yellow flower heads. Excellent for flowerbeds. Hardy. Flowers in July. Plant height: 1.5 m.
Growing tips for the macrocephalic centaury
Suggested time*
end of March
Suggested sowing
Interior
Days to maturity*
80 days
Distance between plants
23.62 inches
Exposure
partial shade|sun
Sowing depth
Three times the size of the seed.
Ideal germination temperature
From 15 to 21℃
Germination time
3 to 7 days
Number of seeds
± 50
Growing cycle
Perennial
Family
Asteraceae (Giant knapweed)
Seed storage
In a dry place away from light.
Seed shelf life
2 years minimum
*The suggested time concerns zone 4b. For zone 5 you can start 2 weeks earlier and in zone 3 delay by 2 weeks. The number of days indicated is calculated from planting in the garden.
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