This is a fascinating article published by Friends of the Earth which gives all gardeners food for thought!…
Centaurea genus (Cornflower). This genus consists of annuals and perennials, with about 500 species. Some of the species are weeds, but many are desirable plants and they will grow in various colours.
Annuals, Perennials or Biennials, Shrubs or Herbaceous
Europe, Med, Asia, Australia
Grown for the flower heads that each have a thistle like centre surrounded by a ring of slender ray petals. Suitable for coastal conditions.
They are fully hardy and will require sun, and will grow in any well drained soil, even poor soil.
You can propagate by seeds or division in the autumn or spring.
Powdery mildew may be problem.
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