Philadelphus Gordonianus Columbianus or Mock Orange
The generic name recalls the Egyptian King Ptolemaius Philadelphus’. The genus contains some 40 species native to North America, southern Europe and the Caucasus, but mostly to eastern Asia. They are deciduous shrubs growing to a height of 6m (20 ft). Theare generally white, very occasionally pale pink or reddish, and are borne in terminal racemes, sometimes dense, at other times consisting of only a few blooms. They are composed of four petals, four pistils, and many stamens. The fruit is a four-valved capsule.
The illustrated species is about 4m (13 ft) high. The bark is yellowish or grey and cannot be peeled, and the young shoots are hairy. The flowers are white, measure 3 to 4.5cm (1 to 1¾ in) and appear in June and July. A native of North America, this shrub has been grown in Europe since 1890.
Propagation by means of seeds is fairly difficult and tedious and mock oranges are therefore generally multiplied by cuttings. They require a moderately deep and heavy loamy. Flowering is more profuse in a sunny aspect but they will tolerate slight shade. To shape the shrubs and increase the number of blooms they should be pruned by removing the older shoots to encourage the growth of young shoots on which the flowers are borne.