Ask for help How to raise gardenias The leaf veins are yellowed Yellow leaves

Gardenias, yellowing of leaf veins, generally have a variety of causes. For example, the potting soil is too wet or too dry, the indoor temperature is too low (less than 20), too much watering and fertilization in winter, the roots are pruned, and the potting soil lacks trace elements. For example, the alkaline soil containing calcare, alkali, phosphorus, manganese, etc., will affect the absorption of iron by plants, affect the formation of chlorophyll, make the young leaf veins lose green, and even spread to the entire leaf.

Prevention and control methods, gardenias in the winter dormant period, need to stop fertilization, control watering. In general, the alkalinization of the soil can be mixed into the soil with pine sawdust, which also has a good effect. Fertilization in spring and autumn growing season, if ferrous sulfate is used, it needs to be fully decomposed with thin cake fertilizer water, press 1:

500 scale used.

1. Overwatering.

When the soil is clay and not loose and breathable, it is easy to accumulate water if it is watered too much, resulting in dark yellow and dull young leaves of gardenia, but no obvious change in old leaves. At this time, it is necessary to place the pot in a ventilated and cool place, wait for the soil to dry and then put it in a suitable position, and it is best to replace it with a loose and breathable substrate for cultivation.

2. The light is too strong.

If the yellow spots appear on the sunny part of the leaves, they only need to be moved to the shade to be maintained, and the newly grown leaves will no longer have yellow spots.

3. Excessive fertilization.

It is mainly manifested in the appearance of brown at the top of the new leaves, the leaf surface is thick and dull, and the old leaves are charred and peeled off. At this time, it is necessary to stop fertilizing immediately, and in severe cases, rinse the soil to reduce the concentration.

The old leaves are yellow and fall off from the bottom up, but the new leaves grow normally. Pay attention to watering when watering enough, water thoroughly.

During the growth of gardenias, the leaves often turn yellow, and the reason is mostly caused by poor cultivation management. Too much water, too little sunlight, too much or too little fertilizer will cause yellowing of leaves, but the yellowing situation is different, and the causes should be carefully observed and analyzed, and corrected.

Water yellow: the young leaves are dark yellow and dull, the old leaves have no obvious changes, the branches are small yellow-green, and the new shoots are shrunk and not long, indicating excessive watering. Depot the flowers, put them in a ventilated and cool shade, and dry the soil ball before putting them back into the pot.

Dry yellow: the yellow of lack of water is different from the yellow of more water, the yellow of lack of water is the withered and dry leaf tips or edges, and the old leaves are withered and yellow from the bottom to the top, but the growth of new leaves is relatively normal. Pay attention to watering when watering enough, water thoroughly.

Burning yellow: strong sunlight directly shines on some shade-loving flowers (such as spider plant, hosta, etc.), which is easy to cause the leaf tips and leaf edges of flowers to wither, and the sunny part of the leaves to appear yellow spots. Move to the pubic area.

Lack of light yellow: If the leaves are shaded for a long time, the leaves cannot get enough sunlight to form chlorophyll, and the whole leaves turn yellow and then fall off, and the disease can be avoided by supplementing light.

Fat yellow: the yellowing of flowers caused by excessive fertilization or excessive concentration is manifested in the dry brown appearance at the top of the new leaves, the general leaf surface is thick and dull, and the concave and convex are not stretched, and the old leaves are scorched and yellow. Fertilization should be stopped immediately, and part of the fertilizer should be washed with plenty of washing in severe cases.

Lack of fat yellow: It is manifested in the color of young leaves becoming lighter, yellow or light green, while old leaves are more normal or gradually turning from green to yellow. Check the potting soil, if there is a dry knot, the soil should be changed, and the thin fertilizer should be applied frequently and some alum water should be poured in a timely manner. Appraise.

The leaves of the gardenia are yellowish from the bottom to the top, but in fact, it is just missing "it", and it can be green back with it.

What is the reason for the yellowing of gardenia leaves, experts tell you these points to keep gardenias evergreen.

See if it's too much water, too much watering, and yellowing. Look for scale insects on the petioles as well as on the back of the leaves, veins and branches on the trunk (if any, it is recommended to wipe them with alcohol).

1. Yellowing caused by lack of fertilizer: This yellowing disease starts from the old leaves in the lower part of the plant and gradually spreads to the new leaves.

1. Nitrogen deficiency: simple leaf yellow, new leaves are small and brittle.

2. Potassium deficiency: old leaves turn from green to brown.

3. Phosphorus deficiency: the old leaves are purple-red or dark red.

2. In the above cases, it can be forced to apply rotten human feces or cake fertilizer.

1. Yellowing caused by iron deficiency: This yellowing disease, manifested in new leaves, is pale yellow or white at the beginning, the leaf veins are still green, and the leaf veins are also yellow or white when it is severe, and eventually the leaves will dry up and die. In this case, the aqueous solution of ferrous sulfate that can be sprayed can be prevented.

2. Yellowing caused by magnesium deficiency: This yellowing disease begins to develop from old leaves to new leaves, and the leaf veins are still green, and the leaves fall off and die when it is severe. In this case, boron and magnesium fertilizer can be sprayed to prevent and control.

Excessive watering, freezing, etc., can also cause yellow leaves, so special attention should be paid during the maintenance process.

There are many reasons for the yellowing of gardenia leaves, and the common one is caused by the physiological disease of "lack of green". Whether it is potted or ground grown, it is more common if the soil is alkaline or iron-deficient. Iron deficiency is manifested as loss of green and yellow between the veins of young leaves, which will cause the whole leaf to turn yellow, and even scorched leaves and branches wilt, and finally cause plant death.

Therefore, it is best to choose well-drained, loose and fertile acidic soil for gardenias; Potted plants should use 2 parts of humus and 1 part of garden soil, and it is better if you add some mountain mud to mix.

Yellow leaf disease occurs in the growth period from May to September, and 0. can be added to the fertilizer solution

1 ferrous sulfate or 0 5 reaming sulfate, applied 1-2 times a month, can receive better results.

Gardenias love sunlight, but should not receive strong direct sunlight. The ground planting should have a shady environment for large trees, which can make its leaves tender and green and shiny. Potted plants should be placed in a shady place for maintenance, not on the balcony or sundeck, otherwise it is easy to burn and cause leaf yellowing and leaf scorch.

Gardenias like moisture and fertilizer, and summer potted plants should pay special attention to watering in the morning and evening so that the potting soil is often kept moist. During the hot summer season, spray the foliage with clean water every morning and evening, and sprinkle water on the nearby ground to increase the humidity of the air. When there is a lot of rain, you should pay attention to drainage, otherwise it will make the roots rot and the leaves yellow.

During the growth period, 20 to 30 rotten cakes, fertilizer water or human feces can be applied every month. Especially in the dry season of summer and autumn, combined with watering and topdressing of available phosphorus and nitrogen fertilizer, the leaf color can be evergreen, and the flowers and leaves are beautiful.

A gardenia is overwatered, which makes the potting soil too much water, causing the air in the soil to decrease, and the root system is injured, causing the leaves to turn yellow and lose their leaves. Therefore, special care should be taken during the maintenance process. In addition, gardenia is a positive flower, temporarily placed indoors is acceptable, a long time without sunlight, can not carry out photosynthetic function, the leaves will turn yellow.

Therefore, in spring, gardenias must be maintained outdoors in full sunlight as much as possible. Two.

Flowers with flower bones are the most vigorous physiological activities, not only to meet the needs of physiological reproduction, but also to meet the needs of reproductive reproduction, which must transport a large number of nutrients through the root system to provide leaves and flowers to develop the needs, at this time, if you suddenly change the environment of the conservation site, or change the pot to break the soil, the physiological balance will be broken, the leaves and flower buds can not quickly adapt to the new environment or get the nutrients they deserve, there will be leaf dropping, bud dropping, and even death.

Gardenia also needs special iron moisture, and iron deficiency will cause yellowing. Some leaves under the roots are a little yellow, not yellowing, yellowing disease first appears on the new leaves, beginning to be pale yellow or yellowish-white, the leaf veins are still green, slowly the leaves atrophy, and even fall off and die. Therefore, gardenia must use well-ventilated, well-ventilated acidic soil, and should also be sprayed with ferrous sulfate aqueous solution frequently in maintenance to prevent yellowing.

Fourth, magnesium deficiency will also cause yellowing of leaves, characterized by the yellowing of old leaves and the gradual development of new leaves, the leaf veins are still green, and the leaves fall off and die when severe. In this case, boron and magnesium fertilizer can be sprayed to prevent and control. Five.

Excessive sunlight can also cause yellowing or even loss of leaves. Gardenia likes semi-shade, afraid of strong light exposure, requires about 50% shade, and can only be directly exposed to sunlight in the morning and evening in summer.

Gardenia is an acid-loving plant, in addition to watering, fertilizer and other factors will cause gardenia yellow leaves, there is also a yellow leaf reason: iron deficiency yellow leaves, in daily watering can add ferrous sulfate with water to water gardenias, can effectively avoid iron deficiency yellow leaves.

Gardenia is non-toxic and can be used as medicine. Regarding the problem of yellowing leaves, you better take a look at the following information to see if it will help you.

Gardenia cultivation method:

1. Soil: Gardenia is an indicator plant of acidic soil, so the slightly acidic environment of the soil is the key to determining the growth of gardenia. The culture soil should be mixed with 7 parts of slightly acidic sandy loam laterite and 3 parts of humus. It is advisable to control the pH value of the soil in between.

2. Temperature: The optimal growth temperature of gardenia is 16 -18. Low temperature and direct sunlight are extremely unfavorable for its growth, so it is advisable to maintain gardenias in a sparse forest or shade shed with good ventilation, high air humidity and light transmission in summer.

In winter, it should be placed in an environment with sunlight and a temperature not lower than 0, and let it dormant, as too high a temperature will affect the flowering of the next year.

3. Moisture: Gardenias like moist air, and watering should be increased appropriately during the growth period. Usually the potting soil can be watered when it is white, and it can be watered thoroughly at one time.

In summer, it is hot and dry, and it is necessary to spray the foliar surface 2-3 times a day to increase the humidity of the air and help the plants cool down. However, after the flowers have buds, they should not be watered too much, so as not to cause buds. In winter, it is better to water on the dry side to prevent the water from rotting the roots.

4. Fertilizer: Gardenia is a fertilizer-loving plant, in order to meet its demand for fertilizer during the growth period, and to maintain the slightly acidic environment of the soil, ferrous sulfate can be mixed into the fertilizer solution in advance for fermentation. After entering the peak growing season in April, you can top dressing once every half month (it is best to mix more water when fertilizing to prevent flower burning).

In this way, it can not only meet the fertilizer demand of gardenia, but also keep the soil environment in a relatively balanced slightly acidic environment, prevent the occurrence of yellowing, and at the same time avoid the sudden supplementation of ferrous sulfate, local acid damage to gardenia.