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.
These showy plants with Heliotrope - like flowers are much used for bedding-out purposes during the summer months. They are easily raised from cuttings in spring, inserted in sandy soil in a close frame, being afterwards potted up and hardened off by the end of May or early June. They bloom with great freedom, the flowers being of various shades, such as pure-white, deep-yellow, rose-pink, orange - scarlet, purple - scarlet, reddish-crimson, and intermediate shades. Fancy names have been attached to many of them, some of the best varieties being Diadem, delicatissima, La Neige, Distinction, Rutilant, Ne Plus Ultra, etc.