How to do the yellow leaves of potted Dendrobium officinale? Change the pot soil to control watering/proper shade.

As one of the most useful varieties of Dendrobium, Dendrobium candidum is very effective, it not only blossoms, but also inherits the medicinal value of Dendrobium, and can treat various diseases of the human body. However, in the process of breeding, many flower friends often encounter a problem, that is, the leaves are yellow, that pot Dendrobium candidum leaves yellow how to do? Today, the editor will solve this problem.

First, how should the leaves of potted Dendrobium turn yellow? find the cause.

As a potted plant, Dendrobium candidum is not easy to raise, once we are a little negligent, such as not in accordance with the cultivation method of Dendrobium candidum to maintain, its leaves may appear signs of yellowing. At that time, the flower friends must be in a hurry. In order to solve this problem, the editor summarized five reasons for the yellowing of the leaves of Dendrobium candidum, and attached a solution. Let's move on.

2. Causes and solutions of yellowing of leaves of Dendrobium candidum.

1. Soil discomfort

In fact, there are many reasons why the leaves of Dendrobium candidum turn yellow, but the first thing we should consider is the soil. With regard to soil problems, it can be divided into two situations, as follows:

① soil is not suitable.

Dendrobium candidum has high requirements for soil, if the soil is not suitable, it will make the roots inactive, resulting in aerial roots exposed in the air, a problem will occur over a long time, its performance is that the leaves of Dendrobium candidum are yellowing.

Solution: change the pot soil, put a large stone in the flowerpot, cover it with a layer of permeable stone, and then cover the stone with a mixture of fermented pine bark and sawdust. Note that the mixture needs to be crushed, sterilized and fermented.

There are many miscellaneous bacteria in ② soil.

Even if the soil is selected, if there is no disinfection, resulting in too many soil miscellaneous bacteria, it will lead to the lack of symbiotic competitiveness of Dendrobium candidum roots, resulting in the symptoms of leaf yellow.

Solution: dry the soil, that is, the mixture in the sun, and then kill the pests and eggs left in the soil with caprylic acid. After a period of time, Dendrobium candidum will return to health.

2. Improper watering

In addition to soil, improper watering is also one of the reasons for the yellowing of Dendrobium leaves. The watering problem is also divided into two situations: one is too much watering, the other is too little watering, the details are as follows:

① watered too much

Dendrobium candidum likes a humid environment, so we should water it frequently to keep the basin soil moist. But once too much watering causes the soil to be too wet, it will cause the roots of Dendrobium candidum to rot and the leaves may turn yellow as a result.

Solution: the stem and rhizome of Dendrobium candidum are not dead, so they can germinate again after the spring is warm, but watering should be controlled: watering every other week or two weeks, after watering thoroughly, spray at ordinary times.

Too little watering for ②

Watering too much does not work, nor too little, it will also cause the leaves of Dendrobium candidum to turn yellow. Once the watering is too little or impermeable, it will lead to the drying of the basin soil, and the leaves will show the symptoms of leaf yellow due to insufficient water absorption.

Solution: watering is suitable for slightly acidic to neutral water, sufficient water is required in spring, summer and early autumn, and watering should be reduced after the Mid-Autumn Festival until watering is completely stopped. Before the leaves of Dendrobium candidum yellowed, it began to reduce watering, further reduced with the yellowing and shedding of the leaves, and stopped when the leaves fell out.

3. Fertilizer problem

After watering, let's talk about fertilization, which is also one of the reasons why the leaves of Dendrobium candidum turn yellow. Dendrobium candidum needs fertilizer, but once the fertilization is improper or too little, there will be such symptoms: the leaves start yellowing from the leaf tip, and then the whole piece yellowed and then fell off.

Solution: encounter the above situation, this may be caused by the lack of potassium, so it is easy to solve, just spray the right amount of potash fertilizer.

4. The light is too strong

Dendrobium candidum likes damp and semi-shady places, although it needs light, it is also astigmatism. Once the light is too strong, it will make Dendrobium feel dry, which is not conducive to its air root breathing, resulting in the phenomenon of leaf yellow.

Solution: while keeping Dendrobium candidum in sufficient light, it should be properly shaded, such as spring, summer and autumn, the amount of shading should be controlled between 30% and 50%, and the light is weak in winter, so the potted plants can be moved to the outside to bask in the sun.

5. The temperature is too high

Dendrobium candidum is very sensitive to the problem, it is not cold-resistant or heat-resistant, once the temperature is too high, it may cause leaves yellowing, or even cause buds to fall off.

Solution: Dendrobium candidum does not like the high temperature, so it should be put in a well-ventilated place in hot summer. If the temperature is too high, it should be cooled down.

Generally speaking, Dendrobium candidum is not easy to raise, coupled with many flower friends are novice, so there will inevitably be leaf yellow symptoms. However, after reading the full text, I believe you have a bottom in your mind. If there is a Ye Huang problem, you can follow the above method. About Dendrobium candidum leaves yellowing, the editor introduced here, hoping to bring help to everyone.

Maintenance methods of potted Dendrobium candidum how to plant Dendrobium candidum at home?

Dendrobium candidum is not only planted on a large scale as a rare medicine, but also developed into bonsai, which can also be planted at home. Dendrobium candidum can not only be used for ornamental and air purification, but also can be produced and eaten by itself. However, due to the stringent requirements of the growing environment, there is also a lot of attention to raising Dendrobium candidum at home. So, how to raise Dendrobium candidum at home? Next, the editor will introduce to you.

To raise Dendrobium candidum at home, we must first understand its main growth rules:

Usually potted Dendrobium candidum will sprout new buds at the end of March and early April, and some flowers will appear on the old stems from May to June, and the leaves will turn yellow and fall in winter. And the most important characteristics of Dendrobium candidum are: like the sun but afraid of the sun, like dampness but afraid of waterlogging; belong to aerial root plants, the growth environment is better breathable.

In addition to the above growth rules, we should mainly pay attention to the following points:

First, be sure to choose a place to block the light.

Because Dendrobium this kind of plant does not like the sunny place, likes the semi-shady place. If you want it to shade about 60% to 70% when there is plenty of sunshine in spring and summer; if you also need some sunlight in winter, you can let it shade between 20% and 30%, or you can keep it out of the sun.

Second, pay attention to heat preservation.

This plant likes a cool and humid environment. The temperature at night is about 10 degrees Celsius or lower, usually about 10 to 15 degrees Celsius. If the temperature difference is small, it will affect its growth and eventually affect the effect of its flowering.

Third, water must be sprayed properly when cultivating.

The purpose of this is to increase the humidity of the air. Dendrobium candidum likes the environment with more water, but this degree must be grasped well, if the temperature is too high, it will also affect the growth, and the humidity is too high, there will be rotting roots, so we must spray water moderately.

Fourth, we should pay attention to rational fertilization.

Generally speaking, it is OK to apply fertilizer once every seven to ten days. If you are dormant, you can not apply fertilizer.

Fifth, we should pay attention to the prevention and control of diseases and insect pests

Potted Dendrobium candidum should clean up the diseased leaves in time, and recommend artificial insecticide, put an end to the use of pesticides, make Dendrobium grow healthily, at the same time do a good job of ventilation and reduce the probability and frequency of diseases and insect pests.

Sixth, finally, let's talk about the emphasis on watering.

Water Dendrobium candidum must be fully watered and thoroughly watered at one time. And the season and weather are the main influencing factors.

[spring] it is usually rewatered when the surface of the substrate is dry, and once in the morning and evening on a sunny day, the suitable watering time is between 10: 12 a.m., the air temperature rises to about 25 ℃, and the water temperature is above 15 ℃.

[summer] it is watered every morning and evening on a sunny day, and on a cloudy and rainy day, replenish or not water properly according to the humidity of the substrate. The temperature is higher in summer, and the watering time should be in the early morning or evening.

[autumn] Water is watered every 1 day or 2-3 days on sunny days, and replenished or not watered on rainy days according to the humidity of the substrate. The suitable watering time is between 10: 00 and 12: 00 in the morning, the air temperature rises to about 25 ℃, and the water temperature is above 15 ℃.

[winter] watering every 2-3 days, watering must be fully watered and thoroughly watered at once. The temperature is low in winter, and the matrix moisture should be dry rather than wet, so watering should not be much.

The above is the planting method of potted Dendrobium candidum introduced by the succulent flower bed. I hope it will be helpful to you. Welcome to continue to pay attention to the succulent flower bed and learn more about the conservation methods of orchid plants.

Introduction to propagation methods and culture management of potted Dendrobium candidum

Dendrobium candidum, also known as black section grass, Yunnan iron, iron, etc., is a herb of the genus Dendrobium of Orchidaceae, the stem is erect, cylindrical, and the raceme is often sent out from the upper part of the old stem with fallen leaves, the core column is yellow-green, the florescence is 3 ~ 6 months, and the stem is used as medicine. it is a yin-tonifying medicine in tonifying medicine, tonifying stomach, nourishing yin and clearing heat. Let's take a look at how potted Dendrobium candidum is raised.

Ecological habits of Dendrobium candidum

Dendrobium candidum likes warm, humid and semi-shady environment, and is not resistant to cold. The suitable temperature for growth is 18: 30 ℃, the suitable growth period is 16: 21 ℃, the dormant period is 16: 18 ℃, the night temperature is 10: 13 ℃, and the temperature difference is 10: 15 ℃. The daytime temperature more than 30 ℃ has little effect on the growth, the winter temperature is not lower than 10 ℃, and the seedlings are easy to be frozen when the temperature is below 10 ℃. Avoid dryness and avoid stagnant water. Prefer light, 50% shading in summer and autumn and 30% shading in winter and spring. If the light is too strong, the stem will be dilated and yellow, and the leaves will be yellowish green, but the sunshine is sufficient, the flowering is good, and the number of flowering is large. The soil should use well-drained and breathable broken fern root, water moss, charcoal chips, broken tiles, perlite and so on, mainly broken fern root and water moss.

Propagation methods of Dendrobium candidum

1. Ramet: 1-year-old or 2-year-old Dendrobium candidum plants with bright green color, strong germination, developed root system and no diseases and insect pests were selected as seed plants, withered branches, broken branches, old branches and overlong fibrous roots were cut off, and the clumps were divided into small clumps with 5-7 stems with leaves in each cluster.

2. Cuttage: Dendrobium candidum cuttings choose false bulbs that grow and enrich without flowering, cut them from the rhizosphere, cut them into segments every 2 to 3 segments, insert directly into peat moss or wrap the base of cuttings with water moss, keep moist, room temperature at 18: 22 ℃, rooting at 30 days after cuttings, and potted plants with roots 3 to 5 cm long.

3. Tissue culture: the tissue culture of Dendrobium candidum usually takes stem tip and leaf tip as explants, but the tissue culture seedlings should be refined for 14 days before cultivation. The specific measure is to move the tissue culture seedlings to the seedling refining room to make them gradually adapt to the natural environment in the open and changing environment. When the leaves of tissue culture seedlings are dark green, they can be planted in bottles.

How to raise potted Dendrobium candidum?

1. Flowerpots: potted Dendrobium candidum should choose flowerpots with larger caliber at the bottom or with holes around them, requiring good air permeability and good leachability. You can also fix Dendrobium directly on rotten wood without flowerpots.

2. Medium: Dendrobium candidum can not use soil species, it is best to use water moss, gravel, peanut shell, moss, coconut skin, pine bark, sawdust, charcoal, wood blocks and other media with good water retention and ventilation.

3. Environment: Dendrobium candidum is suitable to grow in a cool, humid and smooth air environment, so we should not keep it in the sun like other flowers and plants, but should pay attention to shading.

4. Planting: when planting Dendrobium candidum, we should try not to bury the stem of the seedling into the substrate, which can cover most of the roots and water thoroughly after planting.

5. Maintenance: after the planting of Dendrobium candidum, put the iron pot in a well-ventilated, semi-shaded environment, such as a well-lit windowsill, a balcony without direct sunlight or a sunshade.

Note: when the environment of potted Dendrobium is open, Dendrobium should always be placed under the balcony big-leaf plants, which block too strong light, and growers usually only water them, and new buds of Dendrobium grow rapidly in overcast and rainy weather.

Disease and pest control of Dendrobium candidum

1. Soft rot: soft rot is easy to occur in the environment of high temperature and high humidity, and the disease occurs quickly. In severe cases, the whole plant decays and disintegrates into wet rot. At the initial stage of the disease, the control effect of 2000 mg / kg of Kesha 101 wettable powder was the best, and the control effect reached more than 78% 12 days after spraying. At the same time, it is necessary to strengthen the management in the shed, pay attention to ventilation and light transmission and reduce the humidity in the shed.

2. Black spot: black spot harms leaves and wilts leaves, which usually occurs from March to May. 50% carbendazim 1000 times solution can be sprayed 2 times for 3 times.

3. Anthrax: anthrax harms leaves and fleshy stems, and brown or black spots appear in damaged leaves, which usually occur from January to May. 50% carbendazim 1000 times or 50% methyl topiramate 1000 times can be sprayed 2 times for 3 times.

4. Snails: snails are common pests that harm young stems, tender leaves, buds and young fruits. It can be controlled by artificial hunting, poison bait or sprinkling lime and tea bran.

5. Fei Shield scale: the Fei Shield scale parasites on the edge or back of the plant leaves and sucks sap, which is the peak incubation period in late May. 1000 times of 40% dimethoate EC or 1000 times of 50% malathion can be sprayed to kill insects, or the old branches concentrated in the scale can be burned.

6. Red spiders: red spiders can be controlled by removing weeds in the surrounding environment or spraying 800-million 1000-fold low-toxic acaricides, such as 40% dicofol.