Centaurea
The hardy annual and biennial kinds merely require to besown in the open in the autumn. The half-hardy ones must be sown on a slight hotbed, where they should remain till strong enough to be planted in the border. Cuttings of the perennials should be inserted singly in 3-in. pots filled with sandy loam, placed in a shady, cool frame till established, and then watered very carefully. The different varieties vary from 6 in. to 2 ft. in height, and flower from June to August.
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