We all know that bougainvillea must be pruned frequently during maintenance, which is very beneficial to its growth and flowering. Then a flower friend asked bougainvillea bougainvillea whether it needed pruning in winter. 1. Prune diseased and weak branches. If you want to prune, you can only prune some dead branches and some sick branches and weak branches. At this time, we can only prune these delicate branches and fragile branches properly. However, we don't recommend shaping or pruning bougainvillea at this time. Because when we maintain bougainvillea in winter, if we jack it up like this and cut off its branches, then in this case, if the temperature can reach 15 degrees at once, bougainvillea will easily grow new branches and new branches, so these new branches and new branches will be weak. If the temperature drops suddenly, these weak buds and branches are prone to freezing injury, so once these weak buds and branches are frozen, it is very unfavorable for the whole plant to overwinter. Even if these weak buds and branches survive the winter, these branches grow very weak. 2. If pruning can only be carried out in the later stage, it will consume a lot of nutrients in the plant, and then it can only grow into weak branches, which is particularly unfavorable for the rejuvenation of the plant in the later stage. Therefore, when we maintain bougainvillea, we don't recommend that you give bougainvillea a big plastic surgery in winter. However, if the temperature in your place is below 15 degrees all winter, and it has been around 10 degrees, and will not rise to 15 degrees again, then you can trim it. However, to be on the safe side, I suggest you don't repair so much. At this time, bougainvillea bougainvillea can't be pruned so much, but it can improve the cold resistance. How to improve its cold resistance? Generally, I will spray a little of this EM compound stock solution, and this EM compound stock solution will be sprayed on plants. Moreover, root irrigation can effectively improve its cold resistance and enhance its photosynthesis, so that plants can better carry out photosynthesis in spring and accumulate more photosynthetic products for their growth and rejuvenation. This later growth is also very important.