Watering is an important part of the management of flowers and trees. It is also the key to the success of flowers and trees. Scientific watering is very important. First, timely watering time depends on the type of flowers and water shortages. Xerophila flowers and trees such as black pine, oleander, cactus (ball), stone lotus, etc., its strong drought resistance, proper drought is good for its growth, water pouring more anti-causing rot, rotten stem, and even death. Watering Xericaceae flowers and trees, until the surface of the soil is whitish, and the soil is dry when the hand touches the soil, so that it will be “dry and wetâ€. Wet flowers such as calla lilies, fish back bamboo, jellyfish, metasequoia, pterocarya, etc., its weak drought resistance, need to grow in a humid environment, drought can lead to poor growth or withering, and even death. Wet water should be often watered, so that "wet not dry," so that the soil is always in a wet state, but not water, otherwise it is easy to cause rot. The vast majority of flowers and trees such as rose, camellia, sweet-scented osmanthus, clivia, jasmine, pomegranate, and coniferous pine have drought-resistance between xerotic plants and wet plants. They are suitable for growing in dry and wet environments and watering. To master the principle of "see dry see wet", as long as the signs of dry soil are found, water immediately. Aquatic plants such as lotus, water lily, water hyacinth, and goldfish need to live in water for a long time, and they must have sufficient water supply. Second, the amount of watering amount of water due to the origin of flowers and trees, hi water characteristics and different seasons. Tropical flowers and trees require more water, and the amount of water required is correspondingly large. The flowers and plants that are produced in cool regions require less water and require less water. Plants with large leaves and soft texture require large amounts of water. Plants with small leaves, hard texture, or waxy surfaces cover less water. For most of the flowers that are moist and resistant to water, such as rhododendron, camellia, Chinese rose, and other flowers, do not wait until the soil has dried out before it is watered. Just see the topsoil dry and whitish and water it. Too much, to make basin soil dry and wet, neither long-term dry nor wet, but dry and wet. Plum blossoms, geraniums, wax plums, etc. Wet and dry flowers and trees are to be watered according to the principle of “dryness and drippingâ€. We must wait until the topsoil and the soil are dry before we water it, and we must drench it once. With cultivars such as cactus (balls) and cultivars of bonsai, pots must not contain water. Different seasons, the amount of watering varies. The spring temperature rises, evaporation increases, flowers and trees gradually enter a period of vigorous growth, and watering must gradually increase. In southern China, there is a lot of rain in the spring. At this time, the flowers and trees in the wild do not need to be watered separately. Pay attention to drainage. However, it is necessary to water the indoor flowers and plants properly. In summer, the weather is hot, the flowers grow vigorously, the flowers are flourishing, the transpiration is strong, and the amount of watering is the largest. In particular, on drought days, we must pay more attention to drought and ensure normal supply of water. In the fall, the temperature gradually dropped, the growth of flowers and trees slowed down, the water requirement was less than in spring and summer, and the amount of watering should be reduced accordingly. In winter, flowers and trees almost stop growing, they are dormant, and they need the least amount of water. At this time, they need to control the watering, so long as the soil does not dry, it will not be watered. Third, the appropriate way Watering a lot of water, there are sprinkler, flood irrigation, irrigation and so on. The general open field and potted seedlings, due to the short plants, should use a watering can to water, can avoid the excessive water to the small seedlings to fall or make the mud stain the leaves. Large seedlings can be watered manually with watering cans, buckets, etc. Where conditions permit, sprinkler irrigation is best. It can both soak the soil and prevent soil erosion and soil compaction. In the hot sun can not be directly poured cold water temperature is too low, should be stored for one day until its temperature rise and then use. Otherwise, the root hair will be stimulated, hindering its normal absorption of water, leading to "physiological drought", causing the leaves to burn. In the hot and drought season, besides normal watering, water should be sprayed into the foliage and air, which can reduce the temperature and increase the air temperature. However, this method can not be used for some flowers and trees, such as purpurea flowers, gloxinia, etc., because of its leaves have thicker hair, not easy to volatilize after falling on water, can cause leaf rot. After the fertilization, the flowers and trees should be immediately poured with water, so that the fertilizer can be fully dissolved to facilitate the absorption of flowers and trees. For some potted plants such as sweet-scented osmanthus, rhododendron, and camellia flowers, after the first day of evening application of liquid fertilizer, the next morning to pour water once again, to dilute the concentration of fertilizer in pots and soil, so as not only to facilitate root hair absorption, but also to prevent injury to the root. For the dehydrated flowers and trees, their root hairs have been damaged and the water absorption capacity has been reduced. It is not appropriate to pour large water immediately. Only a small amount of water can be used to make the absorption capacity recover. Otherwise, it will easily lead to the separation of the plant's plasmocoil and cause the death of the plant. Fourth, pouring the right water to water the flowers and trees to pour soft water is better, lakes, rivers, pond water is mostly soft water. Hard water contains calcium, magnesium and other inorganic salts, is not conducive to the normal growth of flowers and trees, should not be used, well water is mostly hard water. In natural water, rain and snow are the most desirable, followed by pond water. When watering flowers with tap water, because it contains more chloride ions, it is not conducive to plant growth, and should be used after being exposed to air for 1 to 2 days after exposure to chlorine gas. Do not use water containing dead bacteria, soapy water for laundry, and oily dishwashing water to water the flowers. China Agricultural Network Editor