This section is from the book "Commercial Gardening Vol4", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
A pretty Irish Heath- like shrub, 1-2 ft. high, with dark-green leaves and racemes of globular flowers of white, pink, crimson, or purple, according to variety. One, called bicolor, has white and purple flowers. This species likes a moist peaty soil, well drained, and may be increased by seeds, cuttings, and layers.