Centaurea- Cornflower

There are hardy perennial as well as annual cornflowers; both are suitable for the garden. One annual species is now included in the species Amberboa, but to save space it will be discussed under this heading.

Situation:

Annual species are chiefly suitable for use as bedding plants, in annual borders and as flowers for cutting. The perennial species can be used in the herbaceous border, but are also suitable for cutting.

Soil:

Annual cornflowers are not fussy as to soil; they will grow practically anywhere. The hardy perennials require porous, chalky soil, which must not be too damp in winter.

Propagation:

The annuals are sown in situ fairly late in the season, from late spring onwards. Only the scented cornflower can be sown from about the end of winter onwards in a warm environment. Hardy perennials can also be grown from seed; they are sown in mid spring under glass or out of doors. In addition cuttings may be rooted , while Centaurea montana develops

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