What causes the leaves of February兰花 to turn yellow?
For detailed information on why the leaves of February兰花 turn yellow and tips on solving yellow leaves, please see the introduction below.
Yellowing of orchid leaves is an unavoidable problem in the process of growing orchids. Some are caused by physiological phenomena, while others are caused by diseases and pests. Therefore, we need to analyze specific problems, identify the causes, and deal with them calmly.
The reasons for the yellowing of orchid leaves can be divided into three types: art emergence, grass regression, and diseases and pests. Art emergence and grass regression are physiological phenomena of orchids that cause leaves to turn yellow. Art emergence and grass regression are two different directions of orchid growth, so they need to be discussed separately. This article will focus on these three aspects for a detailed introduction, giving orchid enthusiasts a more comprehensive and in-depth understanding of yellow leaves.
I. Yellowing of orchid leaves caused by art emergence
Art emergence refers to the appearance of colored lines or spots on the leaves of orchids. This phenomenon of colored lines or spots is called "art emergence" in the industry. It is an "evolution" that occurs during the normal growth of orchids. Leaves with yellow lines are called "striped grass" or "silk grass," while those with yellow spots and patches are called "spot grass." These orchids with art emergence are collectively referred to as "leaf art orchids" or "line art orchids." The yellowing of orchid leaves can be divided into five common colors: yellow, white, vermillion, red, and black.
The timing of art emergence in orchids varies. This phenomenon is divided into three types in the industry based on the timing of leaf art emergence: early art emergence, early bright and late dark art emergence, and late art emergence. To put it simply, leaves that are yellow when they first emerge from the ground are called "early art emergence"; leaves that start yellow and gradually turn green are called "early bright and late dark art emergence"; and leaves that start green and gradually turn yellow are called "late art emergence."
What causes the leaves of February兰花 to turn yellow?
How to determine if it is a normal art emergence phenomenon?
When yellow lines or spots appear on orchid leaves, if the leaves are still vibrant and glossy, not wilting, and the yellow parts are very bright with a strong contrast to the green parts, usually with very distinct boundaries, it is art emergence. If there are dark brown discolorations mixed in, no gloss, and the leaves appear wilted and yellow, lacking vitality, it is not art emergence and should be considered grass regression or yellowing caused by diseases and pests. If yellowing is caused by art emergence, we don't need to worry, and there is no need to take action. Just continue normal cultivation.
II. Yellowing of orchid leaves caused by grass regression
Orchids are perennial herbaceous plants with a normal lifespan of about 3-5 years. Well-cultivated orchids can live up to 5 years or more. After reaching their lifespan, the orchid grass quickly yellows and dies. Yellowing of leaves at the end of the normal lifespan is considered a normal regression of orchids.
Normal regression of orchids starts from the bottom, outermost leaves, and leaf tips, spreading from the outside to the inside, from top to bottom. The entire leaf turns yellow rapidly, with the color deepening over time, eventually turning into yellowish-brown, brown, and then withering. In this case, there is nothing we can do. We can simply cut off the withered leaves when they dry up.