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.
In this family there are several very handsome greenhouse shrubs. The two which the writer considers best are A. um-bellata and A. uniflora. The former is the largest-growing species, and the freest-flowering, but the flowers of the latter are individually larger and more showy. They are early spring-flowering plants, coming into bloom about the middle or end of March, and lasting about six weeks. The flowers are white suffused with pink, and are borne at the extremities of the branches, in umbels in the case of the first-named species, and singly in the case of the second. They are easy plants to cultivate. Being natives of the Cape of Good Hope, they like a cool greenhouse temperature, similar to that of a heath-house during winter; but in spring and summer they like a warmer atmosphere, especially when making their growth. Good fibrous loam is the soil in which they thrive best: if dense and heavy, it will be improved by mixing a little good fibrous peat with it; and sand, in any case, is an essential part of the compost. The drainage of the pots should be good. The plants should be cut back more or less immediately after flowering is over, and it may be necessary to thin out the branches at the same time, in which case the weakest should be selected for removal.
In thinning out, care should be taken that the plants be not opened out too much, while the opposite extreme of excessive thickness is also to be avoided. They are easily propagated by cuttings of nearly ripe shoots inserted in sandy soil in a cool propagating-house, giving them time to establish themselves, not attempting to hasten them in any way. W. S.