What causes the leaves of Phalaenopsis to turn yellow?

temperature

Phalaenopsis has high requirements for temperature. The best temperature for its growth is 18-28℃. It is not resistant to high temperature and severe cold. Temperatures above 32℃ and below 15℃ will affect the growth of Phalaenopsis. Therefore, more attention should be paid in both summer and winter to ensure that it grows in a suitable environment.

Water and fertilizer

Phalaenopsis is native to tropical regions, so it likes a high humidity environment, but excessive watering can easily cause root rot.

When the leaves of Phalaenopsis orchid turn yellow and become soft, you can choose to put the whole pot of Phalaenopsis orchid into a large container filled with water when watering. The water level should be 2/3 of the Phalaenopsis orchid pot, and the soil should be moist when you feel it with your hand.

In addition, attention should be paid to fertilization during the growing period. Phalaenopsis generally requires more potassium fertilizer.

illumination

Phalaenopsis prefers a semi-shaded environment and diffuse light. Strong light or long-term placement in a dark environment will affect the photosynthesis of Phalaenopsis, causing the leaves to turn yellow and become soft.

Therefore, you should ensure sufficient light while avoiding strong light exposure. Avoid direct sunlight from May to October and place it on a warm balcony in winter.

Pests and diseases

Pests such as red spider mites and scale insects can also cause Phalaenopsis leaves to turn yellow and become soft. Normally, you should ensure air circulation, clean up dead branches and leaves in time, observe the environment around the plants more often, and ensure clean growth. When there are few insect pests in the early stage, you can use a soft-bristled brush to gently wipe the insects off the leaves, or you can spray pesticides to kill the insects.