What to do if a cactus turns yellow
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More and more people are growing cacti, and some flower friends have found that their cacti are turning yellow, but they don't know what to do if a cactus turns yellow. Coincidentally, another flower friend's cactus has also turned yellow. Let's take a look at the analysis and suggestions given by a senior flower friend for reference.
Flower friend's case: Why did my cactus turn yellow and rot after a few months of cultivation? It is watered once a month, and it is not watered from the top. I'm looking for an expert's answer.
Answer 1: In my judgment, it might be caused by placing it in a poorly ventilated and weakly lit indoor environment for too long. Even without watering, it can appear in a place with poor ventilation and stuffiness. This phenomenon is too common, and the reason is: during the transportation and potting process of the original cactus, there are small holes and wounds between the cacti. There is also a type of cactus that is grafted from other succulents. Since it has no roots when cut and placed in an environment with poor air circulation, it is easily infected with bacteria and rots from the inside out. By the time the problem is detected on the surface, it may be too late, and most of the inside may have rotted. The solution is simple: the newly bought cactus must be placed in a well-ventilated outdoor area for more than a month to allow all wounds to dry and heal. When placed indoors, it is necessary to create an environment with good air circulation and brightness. When the soil is especially dry, the cactus can be moved outdoors for watering and placed for one or two days to allow the excess water in the pot to evaporate before bringing it back. Watering is strictly prohibited in winter. Such care can greatly reduce the chance of a rotten cactus. (Huang Jiansheng, Anqing, Anhui)
Answer 2: Cacti are mostly produced in the tropical or subtropical desert areas of North America, with strong adaptability and vitality. They generally hibernate in winter and grow in summer, prefer abundant sunlight, and require a ventilated and cool environment. Watering should follow the principle of "better dry than wet". The water used should be clean and free of dirt. When watering, be careful to pour slowly along the edge of the pot to avoid splashing soil onto the cactus, which may cause rot. (Xu Jinguo, Rudong, Jiangsu)
Answer 3: The yellowing of the cactus may be due to the decay of the roots. Reasons: ① The bottom hole may be blocked and waterlogged. ② The old soil used for cultivation contains many bacteria and less than 70% sand. ③ The roots or rootlets of the cactus may be damaged during transplantation without disinfection and drying. ④ The pot has poor breathability. ⑤ It may be frostbitten. ⑥ Over-fertilization. (Ai Jincai, Shanghai / Jiang Cunjin, Hebei)
Answer 4: One is long-term placement indoors, lack of sunlight. It is best to place the cactus indoors for 3-4 days and then outdoors for 2-3 days a week. The second is excessive watering. It is difficult for beginners to grasp the right amount of watering. I have a method: insert a dark chalk into the pot, slightly exposing the top. Due to the capillary action of the chalk, when the potting soil is damp, the chalk color is darker, and conversely, the color is lighter or even white, indicating it's time to water. (Zhang Binjun, Suzhou)
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