Chimonanthus praecox is a deep-rooted tree species and must be planted in deep pots. Potted once every 2 ~ 3 years, the topsoil of the soil is removed, so that its root neck gradually emerges from the surface of the pot soil, and its roots are exposed, which is particularly unique. Potted Chimonanthus praecox mainly takes four measures: cutting, fertilizing, watering and pest control. 1. Timely pruning: Chimonanthus praecox has thick branches and is known as the proverb "Chimonanthus praecox does not lack branches". By pruning in time, it can sprout more robust branches and make it blossom more. -Generally, it is advisable to prune the flowers in time after they wither and before they come out, and cut off dead branches, over-dense branches, cross branches and moth-eaten branches. Leave 2-3 pairs of buds at the base of annual branches, and cut off the upper branches to promote germination and branching. After each new branch grows to 2 ~ 3 pairs of leaves, it should be pitted to promote the germination of short and strong flower branches and make the plant shape symmetrical and beautiful. Pruning is mostly carried out in March-June and stopped after July. If it is not suitable for pruning, it will take out a lot of long branches, consume nutrients, make the flower buds not differentiate much, and affect flowering. 2. Timely fertilization: Chimonanthus praecox is a fertilizer-loving flower. Timely fertilization can promote flower bud differentiation and blossom more. Potted Chimonanthus praecox, due to the limited potted soil, the soil should be sandy nutrient soil with high humus and loose air permeability. Apply foliar fertilizer twice in spring, and apply compound fertilizer 1 time every1day from the end of June to lodging. The dog days are also the flower bud differentiation period. It is also the vigorous growth period of new roots, and then apply 1 to 2 times of phosphorus and potassium fertilizer. At this time, fertilization should be sparse, otherwise it will easily burn the roots. After the autumn is cool, apply dry fertilizer once, and apply 40 ~ 60 grams of decomposed cake powder to each pot to better enrich the growth of flower buds. Before and after winter, apply 1 to 2 times of organic liquid fertilizer to provide nutrients needed for flowering. Phosphorus and potassium are the main fertilizers, and nitrogen fertilizer is less. The general ratio of phosphorus, potassium and nitrogen is 2: 1:0.5. In this way, the flowers of Chimonanthus praecox are bigger, more flowers and more fragrant. 3. Proper watering: Chimonanthus praecox is characterized by drought tolerance and fear of waterlogging. For example, the water content is too high, the soil is too wet, and the plant growth is not good, which affects the flower bud differentiation. Therefore, the soil of potted Chimonanthus praecox should be kept dry, not watered at ordinary times, and watered thoroughly in the "dog days" high temperature season to maintain the normal growth of the plant and the normal development of flower buds. Special attention must be paid to proper watering before or during flowering. Too much watering is easy to drop buds and blossom, and too little watering is not neat. 4. Prevention and control of diseases, pests and viruses: Chimonanthus praecox has fewer diseases and more pests, such as aphids, scale insects, spiny moths and leaf rollers. Aphids suck juice on shoots, scale insects suck juice on branches, and spiny moths and leaf rollers bite leaves, new buds and flower buds. Prevention should be given priority to, and flowerpots should be placed in an environment with sufficient light and good ventilation to reduce the occurrence of pests and diseases. If the above pests are found, 50% chlorpyrifos 1000 times can be sprayed. In order to reduce the pollution to the environment of flower cultivation, it can also be killed by indigenous methods. For example, scale insects can be killed with acid and vinegar solutions, aphids can be killed with washing powder water, and a small amount can be killed manually.