Mock oranges (Philadelphus spp.) Are a category of deciduous landscape shrubs featuring fragrant white blooms in spring. The blossoms resemble orange flowers in the look and fragrance, thus the common name. Heirloom varieties were popular in Victorian gardens, along with new cultivars have been introduced in the last several years. They are usually hardy across U.S. Department of Agriculture plant hardiness zones 4 to 8. The adult size will be dependent on the variety you develop and cultural states, depending on average from 3 to 12 feet tall and wide.
North American Varieties
Philadelphus lewisii species are indigenous to the western U.S. and Canada. The true species attains a mature height of about 12 feet and can length 8 feet wide as a tree. Cultivar sizes fluctuate. “Cheyenne” will mature to an average height of 6 to 9 feet and width of 5 to 8 feet. “Goose Creek” is a larger cultivar of this subspecies californica that normally reaches 12 feet tall and 8 ft wide. “Blizzard” is a smaller variety, averaging 4 to 5 feet tall and wide when mature.
Philadelphus coronarius is an imported mock orange species, native to southern Europe and well-suited for cultivation across the western U.S.. The species grows in an upright style to a mean height of 8 to 10 feet. “Avalanche” is a smaller cultivar that only attains 3.5 feet tall. “Belle Etoile” grows to a moderate height of approximately 6 feet. “Virginal” is a particularly fragrant heirloom variety that can grow to 10 feet tall.
Plant your mock orange where it will get whole sunlight or light shade. Most mock orange kinds tolerate a fairly wide range of soil conditions but will do best when grown in rich soil that drains well but retains moisture. If your soil is heavily wooded or clay-dense, incorporating organic matter before planting will help balance drainage and moisture retention, thereby supporting the health, size and vigor of the mock orange. These alterations include completed compost, humus, aged manure, peat moss and chopped pine bark.
Mock oranges bloom on development from prior seasons. Lightly pruning them instantly after flowering is recommended to encourage new development that will bloom another season. This practice also assists your mock orange develop more densely and in the size and shape you would like. If your mock orange becomes less productive or rises out of boundaries, you can prune it heavily, also after spring bloom season. Reducing back 1 quarter of older canes to the ground can replenish a striped orange.