Lemon is an evergreen small tree of the genus Citrus. The leaves are small, oblong, and the margins are finely serrated. The flowers are solitary, open all year round and have a strong aroma. The fruit is long oval or ovate and matures in autumn and winter. The peel is yellow, the flesh is very sour and fragrant, the juice is citric acid, and the peel can be refined with lemon oil.

Lemon potting technology mainly has the following points: The seedlings and the upper pots are cultivated in the south, and should be grafted and propagated. The cultivation in the north is small, mainly using cutting methods, and grafting seedlings can also be purchased. The root system of lemon has higher requirements on water, nutrients and soil. The potting soil should be made into water-permeable, breathable, water-preserving and fertilizer-reducing, slightly acidic culture soil. The basin and basin change time, after the fall, early spring, can be flexibly controlled according to the local climate.

Light and temperature: Lemon is a hi-light plant, but when the sun is too strong, it grows poorly. Generally, the annual average temperature for plant growth for proper growth at noon is above 15 °C, the optimal growth temperature is 23 °C to 29 °C, growth is stopped above 35 °C, and freezing is caused at -2 °C. Lemons generally do not need to cool down in summer, enter the room before the frost, and leave the room after clearing, which can safely overwinter.

Watering and fertilization: Lemons need more water during growth and development, but too much water is not easy to rot. In general, spring is the period when the leaves are spread and the buds are flowering. In summer, the light is strong, the temperature is high, and more water is needed. But it should be timely and appropriate, otherwise it will cause fruit drop. Autumn is the growth of autumn shoots and the rapid expansion of the fruit. It must have sufficient water. Late autumn and winter are the stages of flower bud differentiation, and the potting soil is dry. Lemon is more like fertilization. In addition to the upper pots and basins to apply the base fertilizer, the principle of thin fertilizer should be adhered to during the growing season. The number of fertilization times and the amount of fertilization must be determined according to the growth and phenological period. For example, it is better to apply the liquid fertilizer to the fully fermented cake fertilizer water, and the ratio of cake to water is 1:200. The soil in the north is alkaline, and ferrous sulfate can be added to the fertilizer to form a slightly acidic nutrient solution.

Trimming: Trimming is generally divided into winter shears and summer shears. Winter shears should be based on the principle of “clearing the secrets, leaving the weak and staying strong”, cutting off the dead branches, short-cut weak branches and long branches without the role of primary space. The summer shears are mainly short and long branches on the fruitless tree, and the summer shoots are wiped off on the result tree, and the decaying branches in the upper middle part of the short canopy are short. The flower-promoting and fruit-protecting lemons are the species of the four seasons of flowering, while the northern potted plants are mostly the result of spring flowering. Therefore, after the autumn shoots stop growing, water must be controlled. After the two sides of the blade begin to roll inward, water is moderately applied to promote flower bud differentiation. Pay attention to fertilization in the pot, foliar spray, and cultivate a strong result of the mother branch.

The main measures for the preservation of fruit: First, strengthen the supply of fertilizer water, accumulate nutrients; second, carry out artificial pollination; third, thinning flowers and fruit. The lemon fruit is large and requires more nutrients. The normal leaf to fruit ratio is 30 to 40:1. In accordance with the principle of weakening and staying strong and evenly distributed, firstly, the excessively dense flower buds are removed; then, when the young fruit is 1 cm in size, some fruits are removed; finally, after the physiological fruit drop, the fruit is compared according to the leaf-fruit ratio. It is also possible to leave weak branches, and only one fruit is left in strong branches.

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