Potted soil: Magnolia likes loose and fertile acidic and slightly acidic soil. It can be cultivated by mixing humus soil and garden soil in equal amount, and adding 50-150g bone meal or compound fertilizer of nitrogen, phosphorus and potassium into the soil. The basin should be slightly deeper and larger. Put some broken hard plastic foam blocks at the bottom of the basin to strengthen ventilation and drainage to prevent root rot. Or once every other year after flowering, turn over the pots and change the soil, leaving 1/2~ 1/3 permanent soil. Water and fertilizer: Magnolia grandiflora likes humidity and is afraid of waterlogging. It is very important to water it in time. When the flowers bloom in spring, the basin soil remains moist but not moist; The soil in the back basin is kept moist without water accumulation; After defoliation, the soil in the basin can remain slightly wet but not dry. There should be no drought or flood at any time, especially in the rainy season. Mulan likes chemical fertilizer. Fertilization should take advantage of two key opportunities: February before flowering and May after flowering. Nitrogen, phosphorus and potassium compound fertilizer should be applied once every ten days or so. The former will make buds swell and flowers open, while the latter will promote more pregnant buds and spring flowers in the coming year. When deciduous leaves enter winter, apply a fertilizer mainly containing phosphorus and potassium once to enhance cold resistance and wintering ability, and apply less or no fertilizer at other times. Avoid applying nitrogen fertilizer alone. Light and temperature of Magnolia grandiflora: Magnolia grandiflora likes light and is placed in sunny courtyards and roof gardens. It is common to see the sun growing vigorously. Although it can grow in semi-shade, it is thinner, has fewer flowers and does not bloom on cloudy days. It is cold-resistant, and Beijing and its southern areas can spend the winter outdoors. Pruning: The roots of Magnolia grandiflora have strong germination ability. If you don't need to breed, you can cut it with the length, and you can leave 3 stems in each pot. For branches that are too high and too long, they can be cut short just after flowering. Because of their poor healing ability, they should be coated with sulfur powder to prevent corrosion. If necessary, it should not be trimmed. If the flowers don't need to be kept for reproduction, the pedicels should be cut off. Propagation: Plant separation, layering and sowing are commonly used. After turning over the flowers, change the soil, pour out the plants, cut off the sprouted sub-plants by roots with sharp scissors or a knife, and then plant them separately. It can be transplanted before flowering in autumn or early spring. Small seedlings are stained with mud, and big seedlings must be covered with earth balls. Fertilize once before and after flowering, mainly phosphorus and potassium fertilizer. Maintain soil moisture in high temperature in summer and dry season in autumn. Dead branches, dense branches and short branches should be cut off after flowering and before new branches grow. Sowing, collecting seeds in September, storing sand in winter, sowing in the following spring, and sprouting 20-30 days after sowing. Selection and treatment of Magnolia grandiflora rootstock: rootstock should be inferior seeds in early and full bud stage, with no or few buds. First of all, I saw the crown from the main branch and the central leadership trunk. The horizontal height from the ground should be close to avoid the imbalance of main branches caused by the top advantage; The upper branch is shorter than the lower branch, and the height of the central leadership is slightly higher than the upper branch. The interface should be in a smooth place, and the slit should be cut flat with a cutting knife. Selection and treatment of scion: the scion of Magnolia grandiflora should be a single plant of excellent varieties, such as elm, elm and elm. Annual branches grow vigorously, develop completely, have no pests and diseases, and can be picked as they are picked. Grafting technology should be carried out before and after spring germination to leaf opening period. Generally, in the middle and late March, only axillary buds do not germinate, and the time can be extended. Grafting methods include chopping, cutting and budding. Split is often used for thick branches. First, split the seam with a cleaver or a sharp axe, insert a cork in the center of the split, cut the scion into about 10 cm, cut the base into a wedge shape, and insert the split to align with the outer cambium. Tw

The bark, leaves and buds of magnolia can be used as medicine. After the bud is dried, it is called magnolia flower, which is fragrant and spicy. They contain volatile oil mainly composed of lemon magnolia aldehyde, eugenol and eucalyptus oil. Mainly used for rhinitis and headache, and as analgesic and anti-inflammatory drugs. They are traditional Chinese medicines in China for more than 2,000 years, and they are also used as grafting rootstocks of magnolia and orchids. Magnolia grandiflora not only has large and beautiful flowers, graceful flowers, fragrant smell, high ornamental value and few pests and diseases, but also its bud is named Magnolia grandiflora, which has always been the main medicine for treating nasal diseases in traditional Chinese medicine. Pick before bud stage and dry in the shade in a well-ventilated place for later use. Li Shizhen's Compendium of Materia Medica affirmed its therapeutic effect on nasal diseases. Modern research has proved that the volatile oil contained in Flos Magnoliae can contract the blood vessels of nasal mucosa and promote the absorption of secretions, thus improving the ventilation function of nostrils. For acute and chronic rhinitis and sinusitis, Flos Magnoliae 10g and Fructus Xanthii 10g can be taken, and the concentrated juice is dripped into the nose 3-4 times a day, with good curative effect.