What if the leaves of Dendrobium candidum turn yellow?

Dendrobium candidum has high medicinal value, and there are many people who develop the cultivation of Dendrobium candidum. I believe that many bases for planting Dendrobium candidum have encountered such problems. When Dendrobium candidum is planted, the leaves turn yellow and some are dry. Do you know why? Do you know what to do with it? Let's take a look at it together.

Matrix discomfort

[reason] the aerial roots of Dendrobium candidum are exposed in the air, absorbing air and Rain Water.

[methods] the first choice of matrix materials is bark, followed by sawdust, which need to be crushed, sterilized and fermented, usually mixed with several materials and substrates of different thickness.

The matrix is too wet

[reason] too much watering causes the substrate to be too wet and the roots to rot.

[methods] potted Dendrobium candidum needs to be watered every other week or two weeks. after watering thoroughly, it is usually sprayed, and it is necessary to control the air circulation on the balcony. The stem and rhizome of Dendrobium candidum are not dead, so they can germinate again after spring, but watering should be controlled to prevent rotting roots.

Lack of water and drought

Lack of water leads to yellow leaves. Some growers control too much water, coupled with the current relatively low humidity, which leads to the occurrence of yellow leaves. Although it is winter now, water control should not be excessive, especially Dendrobium candidum planted in bed. The phenomenon of yellow leaves caused by lack of water is more common in winter.

[method] watering is suitable for slightly acidic to neutral water, and there will be too much calcium, magnesium and other minerals in bogey water. Sufficient water is required in spring, summer and early autumn, and gradually enter a dormant state after the Mid-Autumn Festival, and the amount of watering should be reduced until watering is completely stopped. But before the leaves turn yellow, they begin to reduce watering, further decrease with the yellowing and shedding of the leaves, and stop watering when the leaves fall out. In North China, it is necessary to maintain a high indoor air humidity after the water is cut off to avoid pseudo-bulb drying and shrinking. If the room is too dry, the basin can be watered every 1 to 2 weeks.

There are too many miscellaneous bacteria.

[reason] there are too many miscellaneous bacteria in the substrate, and the lack of competitiveness of symbiotic bacteria in the root system leads to the yellowing of leaves.

[methods] fermented bark or sawdust, coconut shell, bagasse, rotten fallen leaves or moss should be fully dried in the sun and treated with caprylic acid to kill the remaining pests and eggs in the soil.

The light is too strong.

[reason] the growth environment of Dendrobium candidum needs to be controlled in a humid and semi-shady place. If the sun is too strong, it will make Dendrobium feel dry, which is not conducive to its air root respiration, so it is very important to control its planting environment.

[methods] sufficient light, spring, summer and autumn, shading amount is controlled between 30% and 50%, sufficient light can form a large number of flower buds.

The temperature is too high

[reason] the leaves of Dendrobium candidum were yellowed due to high planting temperature and overheating.

[methods] Dendrobium does not like too high temperature in summer. It often stops growing in hot summer and should be placed in a well-ventilated place. After the flower bud grows, the greenhouse temperature of 20 ℃ to 25 ℃ during the day and 15 ℃ at night should be kept, not too high or too low, otherwise it is easy to cause the bud to fall off.

Lack of potash fertilizer

[reason] the leaves of Dendrobium candidum start yellowing from the tip of the leaves, and then the whole piece of Dendrobium starts yellowing and then falls off, which may be due to the lack of potassium, which makes the leaves yellowing at first, and then the whole piece falls off.

[methods] Potash fertilizer was sprayed.

Physiological yellow

[reason] in winter, it is normal for old plants (mature plants grown from last year's autumn buds or this year's spring buds) to appear yellow leaves in the middle and lower parts, so don't worry.

[method] Don't worry about it.