1、 How

1. Light: elms like the growth environment with sufficient light, so they need to put the plants on a sunny balcony or outdoors for maintenance. If the sunlight is insufficient, it will make its leaves grow in vain and its color is not bright, and it is also easy to breed various diseases and pests

2. Watering: elm likes wet but is afraid of waterlogging, so it is necessary to reasonably control the amount of watering. When it is hot and dry in summer, it needs to be watered once every morning and evening. At other times, when the basin soil is dry, it can be poured with water

3. Fertilization: fertilizer should be applied once in early spring and early autumn, not more. Fertilizer is mainly nitrogen fertilizer and potassium fertilizer

4. Pruning: elms grow fast and need to be pruned in time to maintain the beauty of bonsai. Pruning and shaping can be carried out in autumn. Cut off the diseased branches, dead branches and useless branches that affect the shape, and prune them according to the shape or the shape after forming

5. Diseases and insect pests: vulnerable to aphids and scale insects. In case of insect pest, you can spray it with 1000 times of Omethoate solution, and then put it in a ventilated place for recovery

2、 What about yellow leaves

1. Yellow leaves caused by insufficient light need to be moved to a sunny place to recover

2. For physiological yellow leaves caused by too low temperature, first remove the yellow leaves, and then put the plant in a warm place for maintenance to keep its growth temperature at about 15-20 degrees. When the weather is too cold in winter, it is necessary to move to a warm indoor place for breeding

3. Excessive watering and poor drainage of flower pots cause root rot, resulting in yellow leaves of elm. If the situation is not serious, control the watering amount in time, move the plant to a ventilated place, loosen the soil and let the excess water in the basin evaporate as soon as possible. In addition, fertilization is not allowed in the short term. If the root is rotten, dig out the plant, cut off the rotten part, disinfect, and replace the soil for planting