Why did boxwood turn reddish brown?

Q: I used the brown soil that I planted with tea trees to plant small yellow poplars last spring. Months have passed since then, and the small yellow poplars have gradually withered and become dead. I don't know why. How to save it?

Answer: most of the tea trees cultivated in the south are acid yellow brown soil, whether it is cultivated big leaf yellow poplar or melon seed yellow poplar, sparrow tongue yellow poplar, etc., there is no soil unsuitable problem. I guess your unit should plant guazihuang poplar. Due to the dry weather in autumn, low temperature and cold weather in winter, some boxwood seedlings that have not yet grown roots, or some boxwood plants cultivated for a certain year, the leaves have changed from green to purplish red, which is due to the change of internal pigment in the leaves to adapt to the cold weather. When the air is warm in spring, the leaves can turn red and return to green. Return to normal green.

You can try scissors to cut up the leaves. If the mesophyll tissue is still green, then gently scrape off the outer skin of the branches and the endothelium is still green. If the mesophyll is no longer green and the endothelium of the branch is green, the plant is dry due to root necrosis, but as long as the root system is not yet dead, after the plant is shrunk in intensity, because of its strong germination ability, the plant can still slowly germinate new branches and leaves and grow into new plants. However, in order to achieve good greening effect, it will be 2 years later. If the plant is completely dead, it will not survive and will have to be replanted. When replanting, it is best to prune the plant immediately after planting, and at the same time strengthen the management of water and fertilizer, which is conducive to its safe survival.