What is the reason for the yellowing of vanilla leaves, inappropriate light, improper water and fertilizer / great changes in the environment

The beauty of Xiangxuelan should be impressed by what you have seen. Not only are the flowers beautiful, but the leaves like swords are also very lovely. But in the process of breeding, many flower friends will encounter the phenomenon of yellowing leaves, seriously affecting the ornamental nature of fragrant snow orchid, what is the reason for the yellowing of fragrant snow orchid leaves? In this regard, the editor summed up four reasons for leaf yellow, and attached solutions, together to understand and have a look.

What is the reason for the yellowing of Xiangxue orchid leaves

Delicate and beautiful flowers, with green leaves, this is the performance of fragrant snow orchid. But if there are yellow leaves, it will destroy the beauty. At that time, the flower friends must be in a hurry! What is the reason for the yellowing of vanilla leaves? According to the experience of people who raise flowers, the editor summarizes four points: sudden change of environment, discomfort of light, improper watering and improper fertilization. next, let's take a look at the solutions.

Second, the solution to the yellowing of fragrant snow orchid leaves.

1. Environmental mutation

With regard to the reasons for the yellowing of the leaves of sweet cherry, many people will think of light, water and fertilizer, but environmental factors are the first thing to consider. Nowadays, many flower friends' fragrant snow orchids are purchased online, which is easy to cause a large geographical span, fragrant snow orchid can not adapt for a while, resulting in leaf yellow symptoms.

Solution: communicate with the shop owner in time to understand the growth environment before Xiangxue bought, and then we adjusted it properly at home. Then slowly change until fully adapted to the current environment, after a period of time, the plant will return to health.

2. Light discomfort

Vanilla likes light, in the process of growth, sufficient light can make it grow better, but fragrant snow orchid relatively likes shade and avoids strong light. In this regard, it is difficult for beginners to control, resulting in light discomfort, resulting in the yellowing of fragrant snow orchid leaves.

The ① light is too strong: the leaves are easy to burn, causing the tip and edge of the leaves to dry up, and the sunny part of the leaves to appear macula. Solution: move the flowerpot to a semi-shaded place for maintenance, and water it appropriately. After a few weeks, gradually move to the sun.

Lack of ② light: Xiangxue orchid can not get enough light, it is difficult to form green leaves, the leaves of the whole plant will gradually turn yellow and fall off. Solution: move the plant to the sun, supplement the light, and pay attention to shading when the light is too strong.

3. Improper watering

In the growth process of fragrant snow orchid, water is indispensable, in the growing season, it needs a lot of watering. However, watering is also the reason for the yellowing of vanilla leaves, so we must have the right amount when watering.

Too much ① watering: the basin soil is stagnant, and as time goes on, the leaf tips of vanilla will wither and turn yellow. The main manifestations are as follows: there is no obvious change in the old leaves, the young leaves are dark yellow and dull, wilting and drooping. Solution: move the flowerpot to a ventilated sunny place and let the water evaporate quickly; in severe cases, take off the pot, wait for the basin soil to dry naturally, and then put it back into the basin.

② watering too little: the soil is dry, the leaves cannot absorb water, and the edges will wither and dry. The main manifestations are as follows: old leaves turn yellow and fall off from bottom to top, and new leaves grow normally. Solution: immediately water it, pay attention to water thoroughly, and ensure that the basin soil is moist; if the temperature is too high, sprinkle water properly to increase the humidity of the air.

4. Improper fertilization

In order to ensure that the leaves of sweet cherry are green and blossom continuously, it is very important to apply appropriate amount of fertilizer. However, many novices do not pay attention to fertilization, even if fertilizing, it is easy to apply more, resulting in vanilla leaves yellowing, affecting the ornamental.

Excessive fertilization in ①: it is easy to cause fertilizer damage and root burning, which leads to the yellowing of leaves. The main manifestations are as follows: the old leaves are scorched and yellow, the new leaves are dry brown, and the surface is concave and convex. Solution: stop fertilizing, watering to dilute the fertility of the soil, serious direct de-basin to change soil.

② fertilizing too little: leaves can not absorb nutrients, will naturally turn yellow. The main performance: the old leaves gradually changed from green to yellow, while the young leaves were dim and yellowish green. Solution: appropriate amount of fertilizer, usually pay attention to thin fertilizer frequently, timely pour some alum water.

Generally speaking, the breeding method of fragrant snow orchid is not difficult, but because many flower friends are novices, it is inevitable that there will be symptoms of leaf yellow. 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. With regard to the yellowing of fragrant snow orchid leaves, the editor has introduced this, hoping to give you some help.

What about the yellowing leaves of Cymbidium fragrans? propagation methods and planting techniques of fragrant Cymbidium

Sometimes the leaves of Xiangxue orchid turn yellow in the process of culture. what should we do? Today, I'm going to tell you about the breeding methods and planting techniques of Xiangxue orchid.

What if the leaves of fragrant snow orchid turn yellow

1. Water yellow: too much watering will cause stagnant water, resulting in yellow leaves, dark yellow and dull young leaves, no obvious changes in old leaves, small yellow-green branches, and short atrophy of new shoots, indicating that they are overwatered. Remove the flowers from the pot and place them in a ventilated, cool, self-drying soil mass and then put them back into the basin.

2. Burning yellow: strong sunlight shines directly on some shade-loving flowers (such as hanging orchids, hairpins, etc.), which is easy to cause withered leaf tips and leaf edges, and macula appears in the sunny part of the leaves. Just move to the shade.

3. Dry yellow: the yellow with lack of water is different from the yellow with more water. The yellow with lack of water is withered or dry at the tip or edge of the leaf, and the old leaves wither and fall off from the bottom up, but the growth of the new leaves is relatively normal. Pay attention to watering enough and thoroughly.

4. Fat yellow: flowers yellowing caused by too much fertilization or too much concentration, showing dry brown at the tip of new leaves, general leaf thickening and no luster, and concave and convex not stretching, old leaves scorched yellow shedding. Fertilizer should be stopped immediately and some fertilizers should be washed with a large amount of washing.

5, lack of light and yellow: put in a shady environment for a long time, the leaves can not get enough sunlight, can not form chlorophyll, the whole leaves turn yellow and then fall off, supplementary light can avoid the disease.

6. lack of fat yellow: the color of the tender leaves becomes lighter, yellow or light green, while the old leaves are more normal or gradually change from green to yellow. Check the basin soil, if there is a dry knot phenomenon, you should change the soil, usually apply thin fertilizer frequently and timely pour some water.

Propagation method of Xiangxue orchid

1. Reproduce by dividing balls

Bulb propagation is the main propagation method of Xiangxue orchid. After the plant was dead and dormant, the underground bulb was dug out, and at this time the mother ball had withered, and a new ball and several daughter balls were produced on it. Generally, the diameter of the new ball was above 1cm, and it could blossom after planting, and the seed ball with a diameter larger than 1cm could also be used as a flowering mother ball, and the effect was better. Those less than 1cm had to propagate for 1-2 years before they could make a flowering mother ball. The bulb also has the habit of dormant at high temperature, which is dug up and stored in a ventilated and dry place.

2. Seed propagation

The cut flower varieties can be propagated by seeds, and the seeds can be collected in time after the seeds are mature from May to June, otherwise the capsule will crack, the seeds will be lost, and the seeds will have no dormancy habit and can be sown immediately after harvest. The optimum temperature for seed germination was 15-20 ℃, and the germination time was about 21 days under dark conditions. When the seedlings had 5-7 leaves, the aboveground parts were withered and yellow, and the underground corms entered the period of high temperature dormancy. After dormancy, the seed balls can be planted and cultivated for 1 year, and then they can be used as flowering mother balls.

The flowering bulb can be obtained in one year by raising seedlings in container. The specific method is as follows: after the seeds were harvested from May to June, they were sown in the greenhouse, and after emergence, they were cultivated in containers in the greenhouse, kept at room temperature for 1518 ℃, and given good water and fertilizer. From May to June of the following year, the diameter of bulbs can reach more than 10m, which can be directly used as flowering bulbs.

3. Tissue culture propagation

At present, tissue culture propagation of Xiangxue orchid has been used in production. For example, virus-free seedlings have been mass produced in some developed countries, and the explants used are young buds. The culture conditions are as follows: temperature 20: 25 ℃, light intensity 1500Lux, pH 5.8.

Planting skills of Xiangxue orchid

The cultivation of fragrant snow orchid is mainly to provide flowers in winter and spring.

1. Soil preparation

Before cultivation, the cultivated soil should be deeply turned, fertilized and disinfected, and the ploughing depth should be at least 20~30cm. Generally speaking, the amount of base fertilizer should be controlled at 100g of N, P, K compound fertilizer per square meter, and the proportion is 12 ∶ 10 ∶ 18. Steam disinfection or chemical disinfection can be used to disinfect the soil. Disinfect with highly toxic agents should be fully dried before use. To avoid harm to people and plants. Then make a high bed with high 10cm and wide 1~1.2cm.

2. Colonization

The planting time is determined according to the time it takes, and it is generally planted 3-4 months before use. Generally speaking, the corms stored at 31 ℃ or newly purchased corms are still dormant, so the bulbs should be treated at the temperature of 2-3 weeks and 13-17 ℃, and then planted, so that the seedling stage can be consistent and the expected flowering can be achieved. During the treatment, the bulb can be placed in a container or underground, placed in a thin layer, the treatment room temperature is controlled at 13-17 ℃, the relative humidity is 80%, and the ventilation is maintained. Every day, when the bulb is found to have a slight bud or root process, it is planted immediately (if the root system or bud has been replanted, it is easy to damage the root bud).

Low temperature and high humidity can promote flowering after dormancy, the treatment temperature is 8: 10 ℃, the humidity is 90%, and the time is 2: 3 weeks. Such as summer and autumn planting, the greenhouse temperature is too high, you can also put the bulb in moist peat or sawdust, put it in a low-temperature cold storage with a temperature of 8: 10 ℃ for 30 to 40 days, wait for the root system to grow, but be careful not to hurt the root system during cultivation, which can save a large area of greenhouse cooling energy and advance the flowering period.

The planting density varies with variety, bulb size and cultivation season. The narrow leaf variety is denser than the broad leaf variety, and the planting density is 80 × 100 plants per square meter, that is, 10cm × 10cm or 10cm × 12cm.

3. Depth and coverage

Generally speaking, the planting depth of Xiangxue orchid is determined by climate, soil and bulb size, and the soil cover depth is generally twice the size of the bulb. The corm can also be buried in winter, but the soil is shallower; in summer, it can be slightly deeper to reduce the effect of high temperature on the corm, and a little deeper soil cover is beneficial to the growth and flowering, and to the full development of the lower root system at the base of the mother ball and the upper root system at the base of the new ball.

After cultivation, such as high temperature, the soil surface can be covered with a thin layer of peat or pine needles, straw and other heat preservation, to prevent soil surface hardening and prevent the growth of weeds.

4. Water management

Water should be watered immediately after planting, and sufficient water supply should be given until the new buds are unearthed. Drip irrigation is better, sprinkler irrigation, must pay attention to prevent; brush topsoil to make the bulb exposed. After rooting, properly reduce the water supply and keep it moist. After flowering, try to keep the soil dry and replenish water only in the morning, so that the soil surface is slightly dry in the afternoon, so as to reduce air humidity and prevent the occurrence of diseases and insect pests.

5. Temperature management

Both root formation and flower bud differentiation need cool environment. The root system grows best under the condition of 15-18 ℃, the flower bud differentiation is the best at 12-15 ℃, and the inflorescence grows fastest at 18-20 ℃. Therefore, at the initial stage of planting, the inflorescence development could not be reversed when the room temperature was kept at 15: 18 ℃ at the initial stage of planting, and the flower primordium was induced at 12: 15 ℃ at 5: 7 leaf stage, and then heated to 16: 17 ℃ to make the inflorescence elongate rapidly and enter the flowering stage.

6. Nutrition management

If the soil is more fertile, you can top fertilizer at 4 to 5 leaves, otherwise you should top fertilizer at 2 to 3 leaves. Only N fertilizer could be applied at the initial stage, P and K should be added during flower bud differentiation, the ratio of P and K was 1 ∶ 1 ∶ 1, 20~30g/ square meters, and fertilized for 3 to 5 times during the growing period.

7. Light and climate

In areas with higher latitudes (above 38N), it is better to supplement light in winter, the supplementary light intensity is conducive to photosynthesis and blossom early, and the effect of supplementing light intensity with high-pressure sodium lamp with reflective binding is good, but continuous light is not conducive to flower bud differentiation. While replenishing light, we should pay attention to the concentration of carbon dioxide in the greenhouse, ventilate as much as possible to ensure the concentration of carbon dioxide or use a carbon dioxide generator to supplement carbon dioxide to the greenhouse. Summer cultivation should be shaded, shading is limited to 30%.

8. Pull the net

Fragrant cymbidium has thinner stems and more flowers, so it is easy to lodge. It is necessary to set up a net in front of 3 leaves, set up a total of 2-3 layers, and keep a grid and a plant. Flower harvesting, processing and market harvesting.

When the first floret on the flower branch is fully colored, it is a suitable harvest time, early in the morning or evening, sometimes several flower branches grow on a bulb, if the lateral branch inflorescence is small and the number of flowers is small, it should be cut off as soon as possible, leaving only one or two flower branches. If it is consumptive cultivation when cutting flowers, it can be cut from the base. If the ball is harvested at the same time, all the basal leaves should be retained, and the water and fertilizer management of the plant should be strengthened until 2 or 3 weeks before the harvest, so that the new ball and seed ball can grow further.

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