It is best not to prune white orchids, but to replace them with tender heads, which can also control long branches. If you have to cut it, you should also grasp the time and carry out the necessary post-cutting care. Because the center of the lignified old branches of Prynne is soft cotton wool, it is easy to absorb water and infect bacteria and rot, and the water at the incision keeps seeping downwards, so the infected branches die step by step. Therefore, the pruning operation must be careful. First, cut it diagonally, and trim it flat. Secondly, it should be tied tightly with plastic paper and isolated from the outside world. If the above two points are not handled properly, when the incision is dry, never cut off the dry part again. The best way is to barbecue and sterilize here with a lighter, and then wrap it up so that the wound can't get any water and prevent further invasion of germs. Therefore, pruning must be carried out in sunny days, so as to make the cut dry as soon as possible and reduce the possibility of bacterial infection.