This section is from the book "Commercial Gardening Vol4", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This genus contains about eighty species of ornamental trees and shrubs, deciduous and evergreen. The Wayfaring Tree (V. Lantana) is a British shrub, 12-20 ft. high, has broadly oblong heart-shaped wrinkled leaves which assume rich tints in autumn. The white flowers appear in May and June, and are succeeded by berries which are first red, but afterwards black. Fruiting sprays are largely used by florists. The Guelder Rose or Snowball Tree ( V. Opulus) attains a height of 15 ft., and is recognized by its lobed leaves and creamy-white flowers, which in the variety sterile become large white Hydrangea-like bracts. There is a variegated form and also one with yellow instead of red berries. V. macrocephalum, from China, has large pyramidal trusses of pure-white sterile flowers like those of the Guelder Rose. The wild type known as Keteleeri has partly sterile and partly fertile flowers as shown in fig. 446. V. plicatum (fig. 447) is a splendid form of tomentosum, and has deeply veined leaves and heads of white sterile flowers. V. prunifolium, from North America, grows 6-15 ft. high, and has dark shining plum-like leaves which are richly coloured with red and purple in autumn. The pure-white flowers appear in May and June, and are succeeded by bluish-black fruits. V. Tinus is the well-known evergreen Laurustinus, 8-10 ft. high, with ovate leathery leaves and heads of white flowers (rosy in bud) which open from November until April and May. There are many varieties of it, such as hirtum, with hairy leaves; lucidum, with large glossy-green leaves; strictum, an erect-growing form, etc. V. Davidi is another quite hardy evergreen species, 1-2 ft. high, recently introduced from China. It has large leathery oblong-elliptic pointed Bertolonia-like leaves, with scattered teeth on the margin, and three distinct veins. The flowers, which appear in April and May, are pure white with bright-red anthers, borne in flat trusses 3-4 in. across. V, Henryi is another evergreen, ibout 6 ft. high, with narrow oblong glossy - green leaves, white flowers, and trusses of crimson and black berries. V. rhytidophyllum is a new and remarkable Chinese evergreen with long narrow deeply veined and wrinkled leaves. Viburnums grow in ordinary garden soil and are propagated by layers and cuttings.
Fig. 446. - Viburnum Keteleeri. Showing fertile flowers in centre, sterile outside.
Fig. 447. - Viburnum plicatum. Flowers all sterile.