Pittosporum is also known as the sea tung tree flower, alias Shuixiang, Qi Lixiang, Bao Zhuxiang, hawthorn flower, it is the evergreen shrub of Pittosporaceae and Pittosporum, and the cultivated form is usually made into small arborous tree type, with plant height of 1 to 3 meters. The crown is nearly spherical, the lateral branches grow round, the old branches are grayish brown, and the shoots are green. The whole plant has a light, special smell. Leaves alternate, sometimes the tops of the branches are often round, leathery, dark green leaves, waxy, extremely bright. Leaves obovate to elliptic, apex obtuse, base cuneate, entire, leaf often turning downward. The inflorescence of the terminal corymbs, the white flowers turn white, later turns yellow, the flowers are green, with a light fragrance. The pods ripen in October and showed three cracks, exposing red seeds. From April to May of flowering period, the ornamental value of flowers is not high. Commonly cultivated varieties include Pittosporum giganteus, with white markings on leaf margins, all dominated by foliage. Pittosporum is a warm-temperate evergreen tree species, native to central and southern China. It enjoys sunshine and is not afraid of direct sunlight. It is also able to withstand half-negative and full-yin conditions. It grows best under warm and humid conditions. There is a certain degree of cold resistance, winter can be exposed in the south, potted plants in the north. Afforestation tree species in southern coastal cities can resist sea tides and sea breeze. Strict requirements on the soil, ability to light saline. Potted plants require humus-rich, loose fertile sandy loam. The amount of long-term fertilizer on the upper pad when the basin, the growth phase, as appropriate, top-dressing compound fertilizer. Pittosporum has a wide variety of seeds and strong sprouting power. It uses bed-sowing in the south and pots in the north. When the capsule turns from green to yellow and just split, it is harvested until the seeds are completely dry and stored until March next year. Seedlings grow fast and can be seedlings after two years. Pittosporum-resistance pruning can be combined with pruning for cutting propagation, with the highest survival rate from April to May. The top 15 cm long shoots were used as cuttings, and the top few leaflets were retained. The inserts were primed with sand or sandy soil and a mixture of sandy soil and peat soil. The soil depth was about 5 cm. Masking film, heat preservation and moisturizing, hair rooting from day 40 to day 50. After the beginning of autumn, a strong root system will be formed and then the planted pots will be planted again. Pittosporum has a strong nature, planting several plants or making hedgerows in the south. The potted plants in the north need to be changed once a year in the spring, and they should be changed into large pots year by year. They should be trimmed to a moderate degree to make them spherical and canopy. In the summer, it is necessary to take heart in time to prevent leggy. In the late autumn in North China and in the north, they need to move into the cold room for overwintering. Pay attention to ventilation and light transmission to prevent the emergence of scale insects. In the early spring, when the outdoor maintenance is carried out, the climate should be dry. Pay attention to the sufficient water in the pot soil, and always spray water to keep the environment moist and the leaves fresh. Pittosporum is very resistant to harmful gases such as sulfur dioxide and has a certain absorption capacity. It is an excellent urban environmental tree species.
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