What's going on when the orchid leaves turn yellow
This article introduces the contents about orchids in the orchidaceae family, including why orchid leaves turn yellow, as detailed below:
For beginners in growing orchids, encountering yellowing leaves is not uncommon, but many orchid enthusiasts cannot figure out the reason for the yellowing leaves. This article is a summary of 12 yellow leaf conditions of orchids by an orchid enthusiast, hoping to be helpful to orchid enthusiasts.
1. Old yellow
Old age, decline, and physical decay. Lack of energy naturally fades away silently. This usually occurs in the offspring of multiple generations, yellowing from bottom to top or top to bottom, which is not a big problem.
2. Fetal yellow
The reaction of a new bud developing, often synchronized with the new bud. Sometimes it turns yellow slowly, sometimes quickly, sometimes starting from the edge of the leaf, sometimes yellow and green mixed. The outcome is that the new bud grows rapidly with new roots not developed, resulting in the death of both mother and child. This is why it is easy to have problems when planting weak seedlings with buds in summer.
Or as the new bud grows and the new roots develop, they both have the ability to be independent and support each other to get through difficulties.
3. Water yellow
Long exposure to rain, the new seedlings suddenly shoot up, the lower part is white and tender, and the leaf sheath turns yellow. It usually does not turn black but gradually withers, and saving water can help.
4. Fertilizer yellow
usually, heavy fertilization will cause the leaf sheath to turn yellow first and then black. In severe cases of fertilizer accumulation, there will be moldy black spots at the leaf groove of the old leaves. Or if the fertilizer is not heavy but accumulates for a long time, it can also cause this.
5. Soft rot yellow
Soft rot refers to bacterial infection, watery, not obvious yellowing, because it happens too fast, the leaf pants become soft and rot, the difference is that there is a phenomenon of dehydration and discoloration of the leaves.
6. Stem rot yellow
There is dry yellowing at the leaf pants, or light yellow, which should be引起 attention. Stem rot starts from the stem, then spreads to each node of the bulb, and then reacts on the leaves, with little dehydration and easily broken when touched. That's why orchids need to be checked frequently.
7. Yin and Yang imbalance yellow
First, exposed to the sun in the hot summer, then suddenly feeling sorry for it, so quickly moving it into the room, and some even turning on the air conditioner, the reaction of the orchid is yellowing of old and new leaves, severe ones scattered. It often occurs in Cymbidium. It is best to move it to a shaded outdoor area and transition slowly. The imbalance of yin and yang, the opening and closing of stomata, causes physiological disorders.
8. Water injury yellow
Entering the rainy season during the germination period or spraying water on the orchid leaves to cool and increase humidity, actually, small water mist is more likely to enter the leaf core, water accumulating in the leaf core, unable to dry due to the leaf groove blocking, which can cause pathological soft rot or physiological water injury, and scars can be seen after the leaves unfold, the characteristic of water injury is often symmetrical.
I estimate this kind of water injury has something to do with uneven cold and heat, if not harmonious, it will force air.
Otherwise, if an orchid is completely immersed in water overnight, the new buds may not show water injury.
9. Root rot yellow
The cause is unknown, the characteristic is that the whole clump quickly withers, dehydrates, and wilts, with all the leaves below completely intact.
10. Sunburn yellow
Yellowish white, or spots, or the whole leaf, sometimes表现在 the leaf tip, hard and transparent yellow, at first, because there were few orchid resources, it seemed very rare, and then turning to books said it is a sign of narcissus, happily, in fact, it is just the yellowing of the sunny mountain grass, which will disappear after being kept in the shade.
11. Small闷 yellow
Often occurs in the heart leaves. Just one piece. The rest is fine. Both Cymbidium and Hemerocallis have it. Pull it out if necessary, or cut it, or leave it alone, related to planting materials, water and fertilizer, placement environment, and temperature and humidity.
The bulbs of orchids have nodes, and leaves and flowers grow on these nodes, the center leaf is like the top node of daylily, and it's okay to break it off, although it doesn't hurt the root, it should also cause alert.
12. Art yellow
If it turns transparent, colorful, tender yellow crystal, or tiger spots - then congratulations to you.
The detailed content of why orchid leaves turn yellow (12 yellow leaf conditions) mentioned above, hoping to bring you help!