Elm bonsai should be placed in a sunny and well-ventilated place. Yushu likes well-drained soil and is not resistant to water and humidity. As long as the basin soil is kept properly moist, water can be avoided. Sprinkle water on the ground in peak season to increase air humidity, but don't spray water on the leaves often, otherwise the leaves will become bigger and affect the beauty of the tree. In winter, the basin soil turns white before watering. According to the growth situation, the decomposed dilute liquid fertilizer containing a large amount of nitrogen and appropriate amount of potassium can be applied once every 3-4 weeks during the growing period. In the growing season, elm has strong germination and fast growth, so it must be pruned frequently to maintain a beautiful tree shape. Generally, when the new branches grow to 4 ~ 5 cm, they should be trimmed according to the modeling requirements, and the branches that grow too vigorously should be eliminated in time. In winter, we should move into a low-temperature room in the north and put it in the sunny place for wintering, while in the south, we can safely overwinter by burying the pot in the soil in the leeward and sunny place. The cycle of changing pots depends on the age of trees and the growth of plants. The time for changing pots should be from February to March. The elm bonsai, which grows vigorously when young, needs to be changed once every 1 ~ 2 years, and it should be replaced with a slightly larger pot. At the same time, about half of the old basin soil should be removed and replaced with loose and fertile sandy cultivation. And cut off the roots that are too long and too dense, and trim and shape the branches properly. If the old pile of bonsai is turned over every 2-3 years according to the growth situation, the original pot is still used, and its operation process is the same as that of the young bonsai. There are several reasons why elm leaves fall off. 1, the basin soil is too dry, and a large amount of water is suddenly added, so that the plant morphology is delaminated. Will suddenly fall leaves. When pests occur, the use of pyrethroids will leave a lot of leaves. If the fertilizer is too heavy and the sun is strong, the leaves will turn yellow and fall into the rain.

Elm is particularly resistant to water and moisture, but it is cold-resistant. Don't order too much water. Water tends to rot roots. Elm is a deciduous plant, and it's nothing if its leaves fall off, but as long as its roots are not rotten. You can water it less, or take out the roots, cut off the rotten parts, dry them and put them in the pot.

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