The latest gentleman orchid leaves yellowing how to do?

Cymbidium is a perennial herb of the genus Amaryllidaceae, which is a semi-negative plant, which likes to cool and avoid high temperature. The suitable temperature for growth is 15-25 ℃, and it stops growing when it is lower than 5 ℃. It has high ornamental value. However, the orchid will also encounter trouble in the process of growth, what should be done if the leaves turn yellow, and what is the reason?

Yellowing of Cymbidium leaves caused by temperature problem

The suitable temperature for the growth of Cymbidium is 1525 ℃. When the temperature difference between day and night is 8: 12 ℃, it is the most suitable for the growth of Cymbidium. When the summer temperature exceeds 30 ℃ for a long time, it goes into semi-dormancy. At this time, if the air humidity is less than 60%, the leaves of Cymbidium will become shallow, yellow and even wilted; if the humidity is higher than 90%, the stems and leaves will grow. In order to prevent the occurrence of these bad phenomena, measures should be taken to cool down, and then ventilation and light transmission should be taken to control humidity. When the winter temperature dropped below 8 ℃, the growth of Cymbidium basically stopped. If the temperature drops below 6 ℃, freezing injury will occur, which will make the leaf tip and leaf edge fade to yellow, and even appear yellow-white necrotic marks.

Yellowing of Cymbidium leaves caused by humidity problems

Magnolia is a humid plant, which requires high humidity of the growing environment. Its most suitable relative humidity range is 70% to 80%. In this humidity environment, the leaves of Cymbidium are green, the veins are clear, the leaves are short, wide and neat, and the ornamental value is high. If the basin soil is too dry for a long time and the temperature is high, it is easy to make the leaves yellow. However, too much watering for a long time can easily lead to hypoxia, hinder the normal respiration of plants, and lead to root rot and even death.

Yellowing of Cymbidium leaves caused by soil Fertilizer

Gentleman orchid likes loose and fertile sandy soil, soil consolidation and insufficient supply of fertilizer will make the leaves yellow and affect flowering. Generally, fertilizers can be applied in spring and autumn in one year. The rotten-resistant leaves must be fermented before they can be used. Without fermentation, the roots are easily burned. The magnolia must change the soil once a year. When the temperature of the maintenance site is above 25 ℃, it is necessary to lose weight or stop fertilizing properly, so as not to burn the fleshy roots with too much fertilization. if the temperature can be reduced to below 20 ℃, you can still apply fertilizer.

Yellowing of Cymbidium leaves caused by discomfort of light

Gentleman orchid is a semi-positive flower, like relatively weak scattered light, not resistant to strong light, too strong light is easy to cause sunburn, light leaves from green to yellow, heavy leaves dehydrate and dry death. Short-day photos in winter and spring are more conducive to flowering. Good lighting is an important condition to ensure the bright color of gentleman orchids. But if the place light is too dark, long-term lack of light, will also make the leaves lose luster, the old leaves are dark green, the new leaves become thin, yellow or yellowish green (yellowish yellow). At this time, you should move the magnolia to a place with slightly stronger light or supplement the light. The leaves of Cymbidium have phototaxis, and should be released to the light in order to keep the side looking into a line and looking at the shape of a fan.

Yellowing of Cymbidium leaves caused by air permeability

The sturdy fleshy roots of Cymbidium not only store enough water, but also put forward higher requirements for the soil on which they live. Only the nutritious soil with good permeability, loose texture and rich humus is suitable for the growth of fleshy roots of Cymbidium. Cymbidium is placed too densely and the surrounding environment is closed, which hinders air circulation and makes the plant thin and yellow. Therefore, it is necessary to strengthen indoor ventilation to avoid excessive density.