What if the leaves of Jianlan turn yellow and black? how to raise Jianlan in winter?

Orchid flowers beautiful, give a noble and elegant feeling, deeply loved by everyone, many people will plant at home, but the planting process appears yellow and black leaves phenomenon, which not only affects the beauty, but also causes damage to the plant itself, so when such problems occur, how should we solve them? Let's take a look at it.

What if the leaves turn yellow and black?

1. Watering should be scientific: it is necessary to decide whether to water and how much water to irrigate according to the season, growth and development stage and the dry and wet conditions of the pot soil. Special attention should be paid to increasing the air humidity to avoid excessive dryness or long-term excessive humidity of the pot soil.

2. Fertilization should be reasonable: thin fertilizer should be applied skillfully, and thick fertilizer and undecomposed liquid fertilizer should not be applied. Water should be poured the next morning after fertilization to dilute the fertilizer and avoid the occurrence of fertilizer damage.

3, light should be appropriate: orchids like half shade, in addition to early spring and winter appropriate to see more sunlight, people should take timely shade measures after summer, avoid direct light, it is best to put under the shade shed or building shade maintenance.

4, timely prevention and control of pests and diseases: to prevent diseases and eliminate pests as soon as possible, especially to pay attention to the prevention and control of anthrax, black rot, scale insects, etc.

5, the soil should be appropriate: choose slightly acidic loose, fertile culture soil, and pay attention to timely change pots, change soil, regularly apply ferrous sulfate solution, keep the pot soil slightly acidic.

How to raise winter orchids

1. Temperature management

In general, if the outdoor temperature drops to 2-3℃, the orchids should be moved indoors for conservation. It is necessary to pay attention to the timing of moving indoors. If the Cymbidium is moved indoors too early, it will affect the growth and development of Cymbidium, greatly reduce the germination amount of Cymbidium or even not grow flower buds, and the number of flowering in the coming year will be much lower than before.

2. Water management

Winter is the dormancy period of Cymbidium, the absorption performance of plant roots greatly reduced, growth slowed down or suspended growth. In winter, the demand for water is not much, at this time to control the amount of watering, but also can not stop watering, you can often spray water or according to the situation appropriate watering to keep the pot soil moist.

In winter, special attention should be paid to preventing root rot. When the weather is sunny and warm, you can move it outdoors to bask in the sun. It should be noted that the orchid can not be placed in a room with a large temperature difference, and large temperature fluctuations are not conducive to the growth of the plant.

3. Ventilation

In winter, when the orchid is cultured indoors, pay attention to the circulation of air, keep indoor ventilation and ventilation. When the weather is sunny and the temperature is relatively high during the day, timely open the window to ventilate and exhaust the turbid air in the room. Do not put the orchid near the air conditioner for cultivation. Cymbidium root is more robust, so in winter in addition to maintaining indoor air circulation, but also pay attention to ensure that the soil permeability.

Propagation method of Cymbidium grandiflorum

1. Plant division propagation: Cymbidium jianense can be carried out in spring and autumn. The dense pseudobulb clusters are cut open and planted with knives. Each cluster has at least 4 conjoined clusters. The roots are properly trimmed and potted. Generally, it is divided once every 2~3 years.

2, sowing and reproduction: conventional sowing Cymbidium seeds in high temperature and high humidity conditions of very short life, must be harvested with sowing, and sterile sowing Cymbidium seeds soaked in 10% sodium hypochlorite solution for 5 to 10 minutes, after taking out the seeds washed with sterile water 3 to 5 times. Sterilized seeds are inoculated onto culture media under aseptic conditions.

What about the root rot?

Rinse the stem base with clean water, then cut off the rotten part with a sharp knife, and then smear the incision with sulfur powder or charcoal powder. To prevent infection. Put it in a cool and ventilated place. After the incision is slightly dry, plant it in plain sand. After 2 days, pour water. Keep the soil moist and do not fertilize it. At about 25 degrees, new roots can grow in about 20 days.

Cymbidium is a plant that is better planted than other plants. It has strong adaptability and high survival rate. However, some problems are easy to occur in plants that are easy to plant, such as yellow leaves and rotten roots. When such situations occur, there is no need to worry too much. As long as the cause is found and treated in time, it can be recovered quickly.