CAMPANULA. Some of the most delightful hardy flowers for borders and for the rock garden are found among the bellflowers or campanulas: a few are suitable for the greenhouse. The border kinds flourish in sunny or slightly shady places and in ordinary soil which has been dug deeply and manured. Planting may be done in autumn or spring. The best perennial campanulas for the hardy flower; border are persicifolia and its varieties Telham Beauty, blue, and Snow King, white, 2-3 feet; glomerata, blue, 18 inches; Hendersoni, mauve-blue, 12 inches; lactiflora, palest blue, 2-3 feet; latifolia macrantha, purple, 3-4 feet; latiloba, blue. 2 feet, and its white variety. These may be raised from seeds sown in fine soil in a frame in spring or by detaching and replanting rooted pieces in summer. Lactiflora may perish after flowering; it is wise to raise seedlings every year or to take care of self-sown seedlings.
The campanulas suitable for the rock garden thrive in moist, gritty soil in slight shade. The best are pusilla, blue, and its variety Miss Willmott, pale blue; muralis, purple blue; G. F Wilson, purple-blue: pulla, purple; garganica, lavender-blue; carpatica, blue. The last named is more vigorous than the others, reaching a height of 12 inches when in bloom.
Some of the rock garden campanulas arc difficult and must be grown in very gritty, thoroughly drained soil such as is provided by a moraine Among them are Allionii, cenisia, Rainerii, and Zoysii. Seeds sown in spring in pots of very fine soil placed in a frame provide the best means of propagation.
The chimney bellflower (campanula pyramidal is) is a handsome plant, 3-4 feet high, suitable for planting out of doors or for cultivate ion in pots. Seeds are sown in .March under glass to provide flowering plants the following year. Campanula isophylla, blue, and its white variety , alba, make charming plants for the room, window, or greenhouse; they should be sown in suspended pots, for they are of drooping drooping growth. They are easily raised from seeds in spring and need a compost of loam, leafmould and sand.
The popular Canterbury Bells are varieties of campanula medium. There are single, double, and cup and saucer varieties in white, pale rose, purple, lavender-blue and other shades. The plants are treated as biennials: seeds are sown in boxes of fine soil in a frame in May. The seedlings are planted on a reserve border when large enough, and are put out in autumn or spring when they are to bloom the following summer. They are useless after having flowered. Plants which do not bloom in the year following seed sowing should not be disturbed: they will flower exceptionally well the next year. See Canterbury Bell.