. The Book of gardening; a handbook of horticulture. Gardening; Floriculture. ox HARDY HERBACEOUS PERENNIALS. 267 Campanulas are handsome subjects, with bell-shaped flowers. The tall-growing kinds will be found invaluable for large borders. Propagation by seeds, cuttings, or division. Campanula persici- folia and its variety 7naxima have blue flov/ers. A white variety {alba) is also grown. These plants attain a height of 2ft. or more, and flower from June to August. C. pyrainidalis (Chimney Bell-flower) (Fig. 150) is a noble plant, forming a bushy pyramid, composed of numerous stems, 4ft. or 5
. The Book of gardening; a handbook of horticulture. Gardening; Floriculture. ox HARDY HERBACEOUS PERENNIALS. 267 Campanulas are handsome subjects, with bell-shaped flowers. The tall-growing kinds will be found invaluable for large borders. Propagation by seeds, cuttings, or division. Campanula persici- folia and its variety 7naxima have blue flov/ers. A white variety {alba) is also grown. These plants attain a height of 2ft. or more, and flower from June to August. C. pyrainidalis (Chimney Bell-flower) (Fig. 150) is a noble plant, forming a bushy pyramid, composed of numerous stems, 4ft. or 5ft. high. These, during June and July, are crowded wnth large blue salver-shaped flow^ers. Its w^hite variety {alba) is similar in habit, differing only in the colour of its flow^ers. The species and its variety are splendid plants, either for the border or for pot-culture. Numerous others are also grown. An excellent plant is C. glomerata (Fig. 151). It grows some 2ft. high, and varies con- siderably as to colour from bluish-violet to white. As the specific name implies, the flowers are produced in clusters. Centaureas are useful border plants, of easy culture in ordinary garden soil. They are increased by either seeds or cuttings. C. dealbata grows i^ft. high, and bears rose-coloured flowers from July to September. C. glastifolia produces pale yellow flowers from June to September, on stems 3ft. to 4ft. high. C. niaa-o- cephala is a useful plant for the back of the herbaceous border. It grows from 3ft. to 4ft. high, and bears large heads ot yellow Thistle-like flowers during July and August. C. viontana is an early summer- flowering species, growing 2ft. high, and producing large bright blue flowers; the varieties alba and rosea differ only in the colour of their flowers. C. piilchra growls I ft. high, and bears purple flowers during August; its variety major has bright rosy-purple flowers and beautifully cut silvery-grey foliage. C. rutlienica growls about 3ft. high ; it has
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