À propos 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
Family
Asteraceae (Centaurea macrocephala)
Number of seeds
± 50
Growing cycle
Perennial
Suggested sowing
Interior
Suggested time*
end of March
Ideal germination temperature
From 15 to 21℃
Germination time
3 to 7 days
Sowing depth
Three times the size of the seed.
Seed storage
In a dry place away from light.
Seed shelf life
2 years minimum
Exposure
partial shade|sun
Days to maturity*
80 days
Distance between plants
60 cm
*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.
Click here to get your hardiness zone
or
create your gardening calendar
with our Quebec partner,
lamainverte.ca.
