This section is from the book "The Gardener V1", by William Thomson. Also available from Amazon: The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener.
As not a few good old plants are being put aside to make room for newer, though, very often, not so valuable ones - when valued according to their beauty and usefulness, and not according to their prices in the catalogues, for anything new brings always a good price - to those who may not know Centradenia rosea (a Mexican plant), I would introduce this old and useful stove-plant. It is of a dwarf compact habit, leaves varying in length from 1/2 an inch to 1 1/2 inch, and about 1/6 of an inch in breadth; dark green above, and purple beneath. The flowers are rose-coloured, small, but very numerous. But the greatest beauty of the plant is its fine graceful habit, in which respect it rivals the Adiantums. It can be struck at almost any season of the year, but the time most suitable is early in spring. Cuttings with three or four shoots on them are the best, as plants can be grown from these in a shorter time than from those with only one shoot. They strike freely in a mixture of equal parts of peat and silver sand, with a top-heat of 65° to 80°. The emission of rootlets will be hastened by bottom-heat, but they strike without it.
The cuttings must be shaded from the sun, and as soon as they are well rooted, they should be potted into 2 1/2-inch pots, in a mixture of two parts peat and one part loam, and a little silver sand. They should be kept shaded until they have taken with their shift, then inure them gradually to light and sun, supply them with plenty of water, and attend to pinching the shoots and keeping off any fiower-buds that may appear. As soon as these pots are filled with roots, shift into 5 - inch pots, using the same compost. For most purposes these pots will be large enough, as plants in small pots have the nicest appearance, and are generally most useful. A temperature ranging from 60° to 75° will suit them all summer. Do not pinch after the end of August. After October they will do in a temperature of 5° below what is recommended for summer. If they have been treated as advised, they will show their flowers in great profusion early in spring. Instead of growing on the old plants, the better plan is to grow young plants from cuttings for next season's stock.