Philadelphus (mock orange) shrub originates from many regions around the world including parts of Asia, South/eastern Europe and parts of America. Most Philadelphus plants produce pure white flowers and all are deciduous meaning they will loose their leaves in winter. Flowering time is usually 5-6 weeks depending on their conditions and they will tend to flower between mid-June and late August also depending on their conditions. Philadelphus prefer a full sun or partial shade position, this will help them to produce lots of flowers during the summer period. Also a great point to be made about this shrub is that they will tolerate a wide variety of soils from clay to well drained soils, this is why it is a very common feature in most gardens. Although pruning isn't often required the best time to prune if you feel the need is in August just after it has finished flowering. The mock orange is one of the most disease resistant varieties shrubs around but one should keep an eye out for black fly, appearing May/June gathering on the ends of the stems near where the flower buds are now starting to appear.