First, how to maintain in winter

1. Get indoors in time: Catharanthus roseus is not cold-tolerant. After the temperature drops in winter, you should move indoors, and it is easy to get frostbite when you put it outdoors. After moving indoors, we should also pay attention to temperature control. The temperature should be kept above 10 degrees to be safe for winter. 2. Increase the light: It likes the sunlight itself, and the light in winter is very mild. It should be placed in a well-lit place and let it bask in the sun. Only with sufficient light can photosynthesis be better, more nutrients can be accumulated, the temperature of plants can be raised, and it can help them survive the cold winter. 3. Water and fertilizer management: If the growth slows down in winter, the demand for water and fertilizer will become lower, and water and fertilizer must be controlled. Don't water the soil before noon. Long-acting fertilizer should be applied once before winter, or it can be stopped after winter.

Second, what should I do if the leaves turn yellow?

The yellowing of its leaves is usually caused by three reasons. First, the soil is uncomfortable. I like slightly acidic soil. If the soil is too alkaline, it will hinder normal growth and yellow leaves are easy to appear. Potted soil needs to be replaced as soon as possible. Second, too much watering will hinder the normal breathing of roots. After a long time, the roots will rot and yellow leaves will appear. The amount of water should be reduced and more soil should be loosened for ventilation. Third, there is a lack of fertilizer. The amount of fertilizer needed in the growing period is relatively large. Without fertilizer and nutrition, yellow leaves will turn yellow. Timely fertilization is necessary.