They look great in rows, and really smell great when planted in groups. Philadelphus Mock Orange shrubs vary in size and some leaf structure. Mock orange shrubs are hardy in Zones 4-8. Together with that attribute, it has a stunning display of pure white, fully double flowers – hence its name – and is very scented. They enjoy areas with full sun to partial shade and moist, well-drained soil. Growing Conditions for Mock Orange Shrubs. Compact, Pittosporum tobira 'Nanum' or 'Nana' (Japanese Mock Orange) is a small, broadleaf evergreen shrub featuring attractive, leathery, dark-green leaves, glossy on the top and with lighter undersides. This plant is very useful as a hedge or anchor plant near buildings because it will only need trimming twice a year. Plant Mock Orange shrubs in rows along your property line to create an ornamental privacy screen or use them as a decorative backdrop for lower growing shrubs. Adding compost to the soil will help improve most issues. It has a naturally mounding shape spreading equally to its height. It can survive well on available rainfall here in the valley and is known to be quite drought tolerant, though sometimes a little additional water can help it to thrive and flower more vigorously. Flowering time for Philadelphus virginal is early summer. Mock orange benefits with mulch in spring and an application of balanced organic slow-release fertilizer – this is especially needed when hard pruning. The Syringa (Philadephus lewisii), or Mock orange, is a perennial deciduous shrub that's native to the Northwestern United States, including California, Washington, Oregon, Idaho and Montana. Most types that are hardy for us are deciduous (drop their leaves in winter) but more southerly species can be evergreen. All have glistening white flowers ranging from tiny, starry little things (four-petalled) to large, bouffy double blossoms. Philadelphus mexicanus 'Double Flowering' (Evergreen Double Flowering Mock Orange) - This is a climbing evergreen shrub that can clamber to 15-20 feet. The mock orange shrub thrives in a sunny location and can tolerate partial shade or light shade site.The soil should be moist, humus-rich and well-drained.It is best planted in autumn through to early spring-time. Mock Orange is a very hardy shrub with deep green shiny leaves. An excellent shrub to use as a backdrop for smaller shrubs. This mock orange is the ‘grand daddy’ of them all as far as size is concerned. Sweet mock-orange is a large, upright growing shrub with delightfully sweet, fragrant white flowers in early summer. Sweet Aroma, Pure White Blooms & Evergreen Foliage Why Sweet Mock Orange Shrubs? The Mock orange has been the official state flower of Idaho since 1931. They are arranged alternately in a whorl around the stem and provide a dense foliage year-round. 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