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.
A fine Californian annual, 1-1½ ft. high, with ovate heart-shaped leaves and white and rose-purple flowers in the type. There are many varieties, including pure-white ones, and some in which the flowers are striped with lilac, rose, or violet. C. grandiflora has rose and blue flowers, and C. verna white and clear blue. A good trade is done in the seeds of C. bicolor, and also in plants in boxes for summer flowering.