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 Chilian plants, remarkable for their long trailing woody stems, smooth glossy-green ovate three-nerved leaves, and large drooping bell-shaped flowers, which are bright rose in L. rosea and waxy white in its variety alba. The plants are hardy in the mildest parts of the kingdom, and have been noted in full bloom in Cornwall in the open air at Christmas-time. A compost of turfy peat, to which some nodules of charcoal and a fair amount of coarse sand and a little turfy loam are added, suits the plants well. It must, however, be thoroughly well drained, as the plants like plenty of moisture during growth. For market work the white variety is more valuable than the red, and may be grown on the walls or rafters of any greenhouse, or even in corridors between ranges of glasshouses. Propagation is effected by layering the stems, as shown in Vol. I., p. 81, fig. 72, afterwards severing each rooted portion with a new shoot and potting it up separately. A little extra heat may be given to encourage rapid growth, but once well established the plants require but little artificial heat. Scale is the worst insect pest, but may be kept in check by syringing occasionally with quassia and nicotine solutions. The young shoots are sometimes attacked by Greenfly, but these may be kept down by similar solutions or vaporizing. The same may be said of Thrips and Red Spider - the appearance of the latter being a sure sign of too dry an atmosphere.