Why do the leaves of Phalaenopsis orchids turn yellow?
The editor will discuss the reasons why the leaves of Phalaenopsis orchids turn yellow and the causes of yellowing leaves, as well as the methods to save them in the aspect of green plants and flowers. Let's learn about it together below.
After the beginning of autumn, the temperature during the day will gradually decrease. During this period, many plants will usher in a new round of growth season. Plants absorb nutrients in autumn and bloom in winter. Many plants bloom in winter, and different plant species have different blooming cycles. It is necessary to take good care of them during the growing period.
Phalaenopsis orchids are a kind of flowers that bloom in winter. Many people say that blooming in winter is a counter-seasonal plant, but this depends on the plant's own growth habits. Not all flowers that bloom in winter are counter-seasonal plants. Commonly seen Phalaenopsis orchids, chrysanthemums, and geraniums are plants that bloom in winter, with Phalaenopsis orchids being one of the representatives.
The blooming period of Phalaenopsis orchids is around the Spring Festival, hence it is also known as the "Spring Night Flower." The entire autumn is the growing period for Phalaenopsis orchids. When the temperature drops to around 25 degrees Celsius, Phalaenopsis orchids will usher in a new round of growth. Among the four seasons, Phalaenopsis orchids grow fastest in autumn, especially in northern regions, where their growth can be seen with the naked eye.
Many orchid enthusiasts are aware that Phalaenopsis orchids grow faster in autumn, so they place them in sunlight for照射, as plants need sunlight for growth. However, in the early stage of autumn, although the temperature has dropped, the intensity of ultraviolet rays from sunlight is still high. Phalaenopsis orchids near windows can easily be sunburned by ultraviolet rays.
Why do the leaves of Phalaenopsis orchids turn yellow?
A Phalaenopsis orchid with very healthy leaves, placed under a window, will start to slowly turn yellow within a week. This phenomenon is a typical case of sunburn caused by ultraviolet rays. If leaves turn yellow, it is necessary to move the plant to a different location promptly and avoid direct sunlight, especially at noon when the sunlight is strong.
Phalaenopsis orchids have a very sturdy growth habit but cannot tolerate intense sunlight. After August 15th, when the temperature has thoroughly dropped, it is then safe to increase sunlight exposure. During this period, full sunlight is also fine. At the same time, it is necessary to increase watering to maintain the moisture of the planting material.
Most Phalaenopsis orchids are planted in sphagnum moss, which does not have the ability to retain water. After absorbing water for a short time, it may appear moist, but within three to five days, the sphagnum moss will completely dry out. Phalaenopsis orchids have a high demand for water in autumn. It is recommended to place a water tray at the bottom of the pot. Each time you water, pour it directly into the water tray to achieve a good moisturizing effect.
When the temperature at home drops below 20 degrees Celsius, a small amount of nutrient solution can be added to the water to increase the orchid's need for nutrients. Supplementing fertilizers allows its roots and stems to absorb more nutrients, which is beneficial for blooming in later stages.
In summary, it is important to pay attention to sun protection in autumn, as sometimes the temperature can still reach over 30 degrees Celsius at noon, even though it is autumn.
The above is [www.lvzhimi.com]'s explanation regarding why the leaves of Phalaenopsis orchids turn yellow and the causes of yellowing leaves, as well as the methods to save them. I hope it brings a little help to your life!