Philadelphus is a genus of some 40 species added to by many garden cultivars. These deciduous shrubs are mainly grown for their delightful flowers, which are generally saucer- or cup-shaped with a prominent central boss of yellow stamens. A number are double or semi-double cultivars. Although they are mainly white, some forms have a pink or purple flush in the centre. They are highly fragrant. The foliage is generally oval, varying from light to mid green, although there are some golden and variegated forms.
Mock oranges are available in a wide range of sizes, from tall ones reaching and spreading over 4m (12ft) to low ones of no more than 75cm (30in). This means that there are at least some forms that can be grown in the smallest of gardens. Place in full sun or a light shade. The golden forms should be planted in light shade to avoid the foliage scorching. The soil should be a fertile, well-drained one. To increase, take cuttings in the summer or hardwood cuttings in winter.