This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
Those elegant greenhouse plants Cantua dependant and bicolor, the former of recent introduction to our greenhouses, flowered here last May, and fully realized all that had been previously stated in their favor. They are of easy culture, and well deserve a place in every collection. Their small but elegant foliage forms a pleasing contrast to the coral-like tube-shaped pendulous blossoms. Cantua dependens, or buxifolia, as it is also named, produces its flowers in corymbs from the extreme points of the principle shoots of the previous year's growth, and are of a beautiful orange color, diffused with scarlet The 0owers of bicolor are of a similar color, but not so long in the tube; solitary, and not confined to the points of the shoots, but are equally distributed over their twiggy side branches, which have rather a rigid appearance. They must not be stopped after they have completed their growth, as they both flower on the matured growth of the previous year, and not on the young shoots like Fuschias. They grow well in a pit that has been previously filled with prepared oak or other leaves. The plants should be kept near to the glass, but not plunged.
They will require attention in stopping, tying out, and standing clear of each other - the former must be especially attended to; for if gross shoots are allowed to ramble, not only will they destroy the uniformity of the plant as regards its growth, but will also monopolize a very undue proportion of the flowers. It may not be desirable to take up the whole of a pit for the Cantuas; should that be the case, they grow well with Fuschias, and might be introduced with the first succession the beginning of March. They will require shifting as soon as the pots are filled with roots, and if desirable, might be shifted twice during the season, supposing they were started in three-inch pots. Abundance of air must be given at all favorable opportunities; and as the season advances, the lights may be drawn off altogether. They will require a moderate supply of water during their growth, but when that is nearly completed, watering may be gradually decreased, and the plants placed out in the open air in a cool place till they begin to drop their leaves, for although they are only part deciduous, they will require but very little water during the winter.
The middle of February, or beginning of March, the plants should be examined with regard to the drainage, returned carefully into the same pot, top dressed and introduced to some gentle forcing-house, and by the middle of April to the beginning of May the plants will bloom and continue in flower a month or five weeks. A succession might be had by introducing more plants a fortnight later. Soil, equal parts of light turfy loam and leaf mold, with enough sand to keep the compost open, will suit them very well. - M. Busby, in Gardeners' and Farmers Journal.