What to Do About Root Rot in Orchids? Master These Prevention and Control Methods

Although orchids love moisture, their fleshy root system is prone to rot from waterlogging; excessive moisture or water accumulating from rain easily causes root rot and can trigger black spot disease. Therefore, the potting soil for orchids should not be kept too wet under normal conditions.

In winter, orchids are in a dormant or slow-growing stage, so the potting soil should be kept on the dry side; spring and early summer are important periods for orchid root growth and leaf development, so the potting soil should be kept slightly moist; however, prolonged excessive moisture can also easily cause root rot, leading to yellowing leaves and even death. This is because excessive water causes waterlogging in the soil, poor aeration, and insufficient oxygen, which hinders root respiration and causes the root system to turn black and rot. During the plum rain or heavy rain season, potted orchids must be protected from these hazards, because with prolonged rain and high humidity, black spots are most likely to appear on new leaves, and the flower buds often show a "rotten sheath" phenomenon, affecting flowering and ornamental value. However, if the potting soil is too dry, it easily causes the pseudobulbs to shrivel or other tissues to lose water, affecting metabolism, and can also lead to weak tissues and poor plant growth.

In autumn, the potting soil should be kept on the moist side to promote leaf growth and proper flowering the following year. Therefore, orchid growers should understand the key principle: "not wet in winter, not dry in autumn." The above explains the different water requirements of orchids at different stages, so the amount of watering should be strictly controlled according to these requirements. At the same time, improper fertilization of orchids can also easily cause root rot; for example, applying too much fertilizer, too concentrated fertilizer, or pouring liquid fertilizer into the leaf sheaths will all have adverse effects on orchid growth. When fertilizing, the amount of fertilizer should also be increased or decreased according to the amount of watering, so that they coordinate with each other for growth.