What if the leaves of potted Phnom Penh orchids turn yellow?

What if the leaves of Phnom Penh are yellowed? 1. Insufficient nutrition

The above is that excessive fertilization will lead to yellow leaves, the same amount of fertilizer is too small, fertilizer is uneven, nutrition supply is not available, or the loss of nutrients is too severe, plants do not get any nutrients, will also make the leaves yellow.

What to do

In the Phnom Penh orchid fertilization combined with watering together, the soil can use more fertile sandy soil, appropriate amount of alum fertilizer water.

2. Lack of light

If Phnom Penh Cymbidium is allowed to grow in a dark environment for a long time, without sunlight, its leaves will slowly turn yellow.

What to do

If you can't change the position of the plant, move the plant to the sun for at least a few hours a day, but pay attention to shading to prevent direct sunlight, sooner or later, or move directly to a brighter place for placement.

3. Apply a large amount of fertilizer

When the amount of fertilizer exceeds the range that plants can bear, it may cause damage to the roots of flowers, which is shown on the potted soil, that is, the leaves of flowers appear yellow leaves and lose their luster.

What to do

Fertilizer should be stopped immediately and a lot of water should be watered. If it is serious, it is recommended to replace all the soil directly, including the soil at the root, but not to damage the root system.

4. Stagnant water is airtight

For root plants growing in stagnant water or too moist soil for a long time will make the plant unable to breathe and cause its leaves to turn yellow.

What to do

When watering Phnom Penh hanging orchid, we should pay attention to its water seepage to ensure that the soil layer in the basin can be evenly watered through.

What to do with the yellowing leaves of Cymbidium? the culture method of Cymbidium

Cymbidium is also a kind of potted plant that many families like to breed, and it is very smart and beautiful to decorate the room with it. What if the leaves of the orchid turn yellow? Let's take a look at the solution provided by the editor of wed114.

I. the growth habits of Cymbidium

1, the hanging orchid likes the warm, humid, semi-overcast environment, it is adaptable, more drought-resistant, but not very cold-resistant. The suitable temperature for growth is 15-25 ℃, and the overwintering temperature is 5 ℃. The growth was the fastest when the temperature was 20-24 ℃, and stopped growing when the temperature was over 30 ℃. Cymbidium has a requirement for temperature, so we should pay more attention to it in the process of cultivation.

2, the orchid does not choose the soil, and grows better in the loose and fertile sandy soil with good drainage. Chlorophyllum does not have high requirements for soil.

3, the hanging orchid is not strict with the light, it is generally suitable to grow under the condition of medium light, and it is also resistant to weak light. Of course, you can't get a lot of exposure.

Second, what if the leaves of Cymbidium turn yellow

1. Improper fertilization: excessive fertilization causes yellowing of leaves, which exceeds the needs of the plant. At first, the leaves are bright and uneven, and then the roots rot, and the leaves are yellow.

Treatment method: should stop fertilizing, irrigate more water, or turn the pot to clean the root and replace the new soil.

2. Nutrient loss: all kinds of nutrient elements in the basin soil have been exhausted, the three elements of nitrogen, phosphorus and potassium have not been replenished in time, the plant is lack of nutrients, and the leaves are yellow and thin.

Treatment method: fertile loam and fertile water should be replaced in time.

3, lack of sunlight: although the orchid is a semi-negative flower, it should see more than four hours of astigmatism at least every day, otherwise the chlorophyll will decrease and the leaves will turn yellow.

Treatment: should set aside free time every day to put the orchid in the sun for a few hours, but not too much exposure to the sun.

4. poor air permeability and water permeability of basin soil: stagnant water in basin soil does not dry for a long time, root respiration is difficult, which leads to leaf yellowing.

Treatment method: loosen the soil and control moisture in time. Fifth, it is impervious to water for a long time. The roots of Cymbidium lose water, and the lower old leaves turn yellow. It should be watered thoroughly to keep the basin soil warm and moist.

Third, the maintenance method of hanging orchid

1. Light

Hanging orchids like semi-overcast environment, spring and autumn should avoid strong direct sunlight, summer sun is particularly strong, can only see some oblique light in the morning and evening, during the day need to cover 50% of the sun's 70%, otherwise it will make leaf tips dry, especially flower and leaf varieties, more afraid of strong sunlight, Phnom Penh orchids grow more beautiful in places with weak light, yellow edges are more obvious, leaves are brighter. But it should be more sunny in winter in order to keep the leaves tender and fresh green. The family potted orchid should be placed in front of the south window, otherwise the leaves will lose their luster and even wither. When conditions permit, it is best to rotate the flowerpot to a fixed direction about 15 °a week to ensure that the drooping degree of the orchid is the same.

two。 Watering

The hanging orchid likes the wet environment, and the basin soil is easy to keep wet. Summer watering should be adequate, around noon and evening should also spray water on the branches and leaves, timely cleaning the dust on the leaves to prevent the leaves from drying up. However, the fleshy roots of Cymbidium can store a lot of water, so they have a strong ability to resist drought and will not dry to death if they are not watered for several days. Under 5 ℃ in winter, less watering, basin soil should not be too wet, otherwise the leaves will be easy to yellowing.

3. Fertilizer application

Cymbidium is a more fertilizer-tolerant foliage plant, if the lack of fertilizer and water, it is easy to scorch head aging, leaves yellowing, loss of ornamental value. From late spring to early autumn, organic fertilizer can be applied every 7-10 days, but less nitrogen fertilizer should be applied to Phnom Penh, Jinxin and other mosaic varieties, lest the color of flowers and leaves fade or even disappear. The retting organic fertilizer such as bone powder and eggshell can be applied properly. after full fermentation, take appropriate amount of diluent and irrigate every 10-15 days to make the flowers and leaves bright and bright.

Liquid fertilizer is applied every two weeks during the growing season. Mosaic varieties should apply less nitrogen fertilizer, otherwise the white or yellow markings on the leaves will become inobvious and stop fertilization when the ambient temperature is below 4 ℃.

4. Pruning

Usually cut off the yellow leaves at any time. The basin can be turned once a year in March to cut off the old root, rotten root and excess fibrous root. Cutting off some of the old leaves of Cymbidium in the first and middle of May will promote the germination of more new leaves and small orchids. The root system of Cymbidium is quite well developed, and the flowerpot should be changed in time after breeding for a period of time, so as to avoid root accumulation, resulting in yellow leaves, wilting and other phenomena.

The orchid is not only available for viewing, but also can absorb indoor harmful gases such as carbon monoxide, carbon dioxide, sulfur dioxide and nitrogen oxides, and act as an air filter. I hope everyone can grow a healthy and good plant.

IV. Main varieties

There are many kinds of hanging orchids, each with different forms and characteristics. There are five common ones: such as orchids, purple orchids, flower orchids, gold leaf orchids, silver-edged orchids.

1. Cymbidium: the stem is not separated from the leaf, the leaf is drooping, the leaf is dark green, it blossoms in June or July every year, and the flowers are yellowish and white.

two。 Purple orchid: branches into nodes, each node leaves, petiole all purplish red, leaves thick and glossy, all drooping, blooming from June to October every year, pink in color.

3. Flower orchid: the branches are trailing, the branches and leaves are drooping, the leaves are peach-shaped, the edges of the leaves are golden, and pass through the center of the veins, and the back of the leaves is purple and gives off light.

4. Phnom Penh orchid: there are yellow lines around the green leaves.

5. Silver-edged hanging orchid: the green leaf is painted with white edge, which is more bright.

V. Disease and pest control

There are few diseases and insect pests in Cymbidium, mainly physiological diseases, yellow leaf front, stagnant water in basin soil and poor ventilation will lead to root rot and root rot, so fertilizer and water management should be strengthened.

1. Shell worm

Check regularly and wipe off the shell insects on the leaves in time.

Prevention and control methods:

According to the occurrence of shell insects, spray during the peak period of nymphs. Therefore, most nymphs do not hatch soon, the body surface has not yet secreted wax, the shell has not been formed, and it is still easy to kill with drugs. Spray every 7-10 days for 2-3 times in a row. Spray with 1000 times of omethoate, 1500 times of malathion, 1000 times of imidophos, 1000 times of 50% dichlorvos, or 3000 times of 2.5% deltamethrin.

two。 Whitefly

Prevention and control methods:

Irrigate the roots with 500-800 times of carbendazim wettable powder once a week for 2-3 times.

3. Aphids

Aphids are one of them in spring and should be wiped out in time.

Prevention and control methods:

Spray 1500 times omethoate to kill. [5]

4. Mites

The second is mites in summer and autumn, which needs to be killed with 1000 times triclofenac. Pay attention to ventilation and increase leaf humidity, can reduce the infection of mites.

5. Root rot disease

Prevention and control methods:

Prevention can use wet powder according to 2-4 grams per square meter for root irrigation, can also be used before or at the initial stage of the disease with 1500-3000 times root irrigation, each plant 200ml solution. When the disease is serious, the diseased plants should be removed and root irrigation should be carried out at the same time.

6. The leaves turn brown

The abnormal phenomenon of yellowing and browning of leaves appeared more than 20 days after entering the room, which may be due to the characteristics of chilling injury caused by low temperature to its leaves. Hanging orchid, sexual like warm, humid and semi-overcast environment, not cold-resistant, than the general green-leaf orchid cold resistance is worse, afraid of high temperature and strong light exposure, but also not resistant to drought, salinity and stagnant water. The suitable temperature for its growth is 13-28 ℃, and the ambient temperature in winter should not be lower than 7 ℃.

After Frosts Descent, the lowest temperature in the morning may be close to 4 ℃, which will bring obvious chilling injury to Cymbidium plants. Although it could not be shown immediately at that time, after moving indoors, due to lack of light, dry air, high room temperature, poor ventilation and other reasons, it is bound to make the chilling-injured Cymbidium plants. It shows the characteristics of yellowing of green stripes and browning of leaf edges on the leaves. However, as long as its fleshy root system has not rotted and died due to cold injury, put it in a place with bright light, control basin soil watering, increase foliar spray, turn the basin and change it before coming out of the room next spring; at the same time, trim off the withered and necrotic leaves, strengthen water and fertilizer management, the plant can quickly restore exuberant growth.

The function of Phnom Penh Cymbidium and the introduction of the method of hydroponics in Phnom Penh.

As we all know, with the development and wide application of science and technology, many plants and flowers can be cultivated in soilless culture, that is, hydroponics, and so is Phnom Penh. It is a very good plant with high ornamental value and environmental greening and purification. At the same time, Phnom Penh Cymbidium has strong vitality and good adaptability, and there is no problem with aquaculture. So what is the function of Phnom Penh hanging orchid? what is the hydroponic method of Phnom Penh hanging orchid? Now let's take a look at it together.

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The function of Phnom Penh hanging orchid

Phnom Penh Cymbidium, which is essentially the same as the general Cymbidium, is a perennial evergreen herb of Liliaceae. Its plant leaves show a wide linear, tender green, the edge has obvious yellow patterns, so it is called Phnom Penh hanging orchid. As a kind of indoor evergreen plant, its function is more. So what are the functions of Phnom Penh hanging orchids?

1. Decorative function

Phnom Penh hanging orchid has a high ornamental value, which is probably known to all. It is one of the very traditional and famous indoor hanging plants, its leaves are slender and soft with climbing and hanging, and the leaves can hang down and stretch out from the plant stem, which is very comfortable. The green leaves are evergreen all the year round, masculine and soft, showing the crane flying high on its wings, so it has the laudatory name of folding crane orchid, and its decorative effect is very obvious.

2. Afforestation function

Phnom Penh as a green plant, evergreen all the year round, naturally also has a very strong green role. And Phnom Penh hanging orchid unique shape, scattered hanging orchid leaves constitute a unique hanging landscape, expressive force of an obvious three-dimensional beauty, the greening effect of plants on the environment is very obvious and strong.

3. Purification effect

Phnom Penh also has a very strong indoor air purification effect, it is a good indoor air purification plant, with the laudatory name of "green purifier". It is understood that a room on the Phnom Penh orchid pot, can absorb the indoor toxic air, it can be seen that its purification capacity is very strong, so Phnom Penh orchid has a very good purification effect.

Introduction to the method of hydroponic culture of Phnom Penh orchid

Phnom Penh Cymbidium as a kind of tenacious plant, its adaptability is very good, so the hydroponic culture of Phnom Penh is relatively easy, so how is Phnom Penh hydroponic culture?

1. Prepare the container

Usually hydroponic Phnom Penh hanging orchids with ordinary glass bottles or special container bottles are OK. This container bottle can be single-layer or multi-layer, the quality of the bottle should be good, there must not be any defects or gaps.

2. Select plants

Dig out the potted plants of Phnom Penh, wash the soil from the roots of these orchids with water, cut off all the old roots, fibrous roots and rotten roots near the plant roots with scissors, and then cut off some of the unhealthy leaves of the orchids.

3. Upper pot colonization

Put the orchid into the container, notice that the root of the plant needs to pass through the upper hole and then enter the lower bottle, put the right amount of pottery or stone rice in the filtered sieve to keep the plant upright, put in the right amount of water and nutrient solution.

4. The next step of maintenance management is to take good care of Phnom Penh orchids. Note that the water should be changed every two or three days, and then because the hydroponics has just begun, the plants may not adapt very well and will rot, so pruning and sterilization should be done in time.

Summary: Phnom Penh is one of the very famous indoor green plants, its role is various, the most famous is the role of green purification, and its vitality is strong, aquaculture is still very easy. If you are interested, you can try.