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Cold-resistant hibiscus maintenance
Cold-resistant hibiscus, likes sunlight, but also slightly shade-resistant, grows best in sunny and well-ventilated places. Its adaptability is quite strong, and it is not strict on soil requirements. However, in loose, fertile and well-drained soils, it grows more luxuriantly.

1. Light and temperature
Cold-resistant hibiscus loves light very much. It needs to be placed in a sunny place. The daily light duration should reach more than six hours, so as to ensure that the plants can thrive and the flowers and leaves are lush. However, when the sun is high in summer, it can be properly shaded to prevent burning of the leaves. Its cold resistance is outstanding and can withstand a certain degree of low temperature. However, when it is extremely cold in winter, some protective measures need to be taken, such as wrapping the base of the plant with hay, quilts, etc., to help it survive the winter safely.

Second, watering and fertilization
1. ** Watering **: Cold-resistant hibiscus likes a humid environment, but avoids water accumulation. Daily watering should adhere to the principle of "see dry and see wet". After the soil surface is dry, it can be watered again. Each watering must be watered thoroughly to allow water to penetrate into the deep layer of the soil and meet the water content needs of the plant root system. During the high temperature season in summer, water evaporates rapidly, so the amount of watering needs to be appropriately increased; while in winter, plants grow slowly and demand for water decreases, so the frequency and amount of watering should be controlled.
2. ** Fertilization **: Fertilization is the key to ensuring the good growth of cold-resistant hibiscus. During the growing season, a thin liquid fertilizer should be applied once a month to provide nutrients for plant growth. Liquid fertilizer is mainly nitrogen fertilizer, and an appropriate amount of phosphorus and potassium fertilizer can promote the flourishing of plant branches and leaves. Before the flowering period, phosphorus and potassium fertilizers, such as potassium dihydrogen phosphate solution, should be applied every half month to effectively promote flower bud differentiation, increase flower volume and flower color. After flowering, fertilizer needs to be replenished in time to restore plant vitality and store energy for growth in the coming year.

3. Pruning and reshaping
Pruning is essential for the growth and beauty of cold-tolerant hibiscus. During the winter dormant period, the plant can be fully pruned once. First, cut off all diseased branches, dead branches and weak branches to reduce nutrient consumption and prevent the spread of diseases and pests. Secondly, thin pruning is carried out on the branches that are too dense to enhance the ventilation and light transmission inside the plant. Furthermore, the branches can be appropriately short-cut according to personal preferences and plant growth trends to shape the ideal plant type. During the growing season, if the plant is found to have long branches, it should be pruned in time to maintain the beauty of the plant.

4. Pest control
1. ** Diseases **: Common diseases of cold-resistant hibiscus include leaf spot disease, powdery mildew, etc. Leaf spot disease is mostly caused by poor ventilation and high humidity in the environment. If diseased spots are found in the leaves, the diseased leaves should be removed in time, and sprayed with carbendazim, methyltobuzine and other fungicides for control. Spray once every seven days and spray two to three times in a row. Powdery mildew is mainly manifested as the appearance of white powdery matter on the surface of the leaves, which can be prevented by strengthening ventilation and reducing humidity. If the disease has occurred, spray control can be carried out with agents such as powder rust Ning.
2. ** Pest pest **: In terms of insect pests, aphids and red spiders are more common. Aphids often gather on the tender tips and the back of the leaves to suck juice, causing the leaves to Imidacloprid, amidacloprid and other agents can be used for spray control. Starscream spiders mostly occur during high temperature and drought, and will form webs on the leaves and suck leaf juice, causing the leaves to turn yellow and dry. To control Starscream spiders, you can spray with abamectin, pyridacloprid and other agents. Note that the front and back sides of the leaves should be sprayed.

Do the above cold-resistant hibiscus maintenance points well, so that it can bloom in the courtyard or garden. Delicate flowers add a brilliant color to the environment.