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.
This South American perennial with drooping or creeping stems, spoon-shaped leaves, bell-shaped flowers 1-2 in. across, is a charming plant for growing in window boxes or pedestal vases. It flourishes in moist sandy soil, and may be increased by cuttings, seeds, or rooted portions of the stems. N. frutescens has narrow leaves and delicate blue or white flowers; and N. gracilis has long-tubed white blooms streaked with purple and with a yellow centre. The plants are raised from seeds annually in the same way as China Asters, Zinnias, etc.