This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This is an attractive border plant, a kind of Giant Scabious, 5-6 ft. high, producing masses of pale-yellow flowers very useful for cutting. C. leucantha is about 4 ft. high, more compact in growth, and has white flowers. Both kinds are easily raised from seeds, or may also be increased by division.