1、 Strong light

Phyllostachys pubescens is suitable to grow in a semi shady environment. If it receives direct light for a long time, its leaves are easy to be burned, resulting in black spots. In this case, it is necessary to put the plant in a cool place in time to avoid further exposure. At the same time, spray water properly and maintain good ventilation so as to recover as soon as possible

2、 The temperature is too low

Phyllostachys pubescens is native to tropical areas and has weak adaptability to low temperature. If the temperature is lower than 15 ℃, it will stop growing and be frostbitten below 0 ℃. If there are black spots on the leaves caused by frostbite, it is necessary to put the plants in a warm place indoors or put bags on the upper part to keep warm to avoid further freezing

3、 Nutrient deficiency

The growth of Phyllostachys pubescens is inseparable from sufficient nutrients. If it is not fertilized, the plant will grow poorly, diseases and pests may occur, and black spots will appear on its leaves. In daily maintenance, we must pay attention to fertilization, which should be applied every 15-20 days. The fertilizer should be sprayed on the leaf surface with rotten cake fertilizer water and potassium dihydrogen phosphate

4、 Developed roots

For Phyllostachys pubescens, the developed root system is the key to the good growth of the plant, but if the root systems are intertwined, it will also affect its growth. At this time, you need to take the plant out of the flowerpot, check the condition of the roots, cut off the excess roots with scissors, and plant it in the flowerpot again after the wound is dry