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.
Lovely stove Gentianworts, mostly from Ceylon, are raised from seeds or cuttings, and flourish in a mixture of sandy peat and loam. The best kinds are afftne, bluish lilac; Forbesi, deep blue; macranthum, rich violet purple; and zeylanicum, violet - all about 9 in. high.