Why do the sharp leaves turn yellow when the family is raised smoothly?

The main reasons for the yellowing of the smooth sailing tip are: the air is too dry (spraying water on the leaves properly), the fertility is not enough (adding fertilizer once a week), and the soil is too dry (the soil requires looseness, good drainage and ventilation, and clay is not allowed. Humus soil and peat soil can be mixed with a small amount of perlite as matrix).

As long as the yellow part of the tip of the leaf is cut off, the flowers will turn green in a short time and lose their ornamental value, or they can be reduced.