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.
As a market plant the Heliotrope (Helio-tropium peruvianum) has long been popular, and is still grown on fairly large lines for bedding-out purposes in summer. Early in the year cuttings of the young shoots are inserted in pots or shallow boxes of sandy soil and placed in a warm greenhouse. There are many varieties, varying in colour from pure white to deep violet, including the following: White Lady, white; Queen Marguerite, deep blue; Swanley Giant, bright blue; Mina, blue; Miss Nightingale, purple, a very popular sort; President Garfield, mauve purple, etc. Standard and half-standard plants are popular in public gardens as "dot" plants over Begonias, Fuchsias, and other plants of a dwarfer nature.