Culture methods and matters needing attention of family potted rhododendron

Rhododendron, also known as rhododendron, pomegranate and rhododendron, is a deciduous shrub and deciduous shrub of the rhododendron family. There are about 900 species of rhododendron in the world. China is the country with the largest distribution of rhododendron, with more than 530 species. Rhododendron is one of the top ten traditional flowers in China.

Soil requirement

If you want azaleas to bloom beautifully, you should first be familiar with the soil in which azaleas grow. The pH value is between 5.5 and 6.5. Do not use alkaline or clayey soil. The suitable growth temperature is 12 ℃ to 25 ℃, shade and sunscreen in summer and frost protection in winter. It is best to move indoors. According to the details introduced above, the azaleas will bloom very beautifully if they are cultivated carefully. Cuckoos like fertile soil. The cultivation of rhododendron is the most suitable for the acid humus soil which has been used for many years. Clay permeability is poor, poor drainage, not suitable for use, especially the soil containing lime must not be used.

Fertilization method

When topdressing, do not pursue alkaline fertilizer and water. Burying lard and other oils into the soil after rancidity can make the cuckoo grow vigorously, blossom more and have bright colors. Correct use of nitrogen, phosphorus and potassium fertilizers. Nitrogen fertilizer is sufficient, leaves are thick green, and the growth is exuberant. Insufficient nitrogen fertilizer, light and dull leaves, thin and old leaves, short and thin branches, few flowers and too much nitrogen fertilizer will lead to overgrowth. The phosphate fertilizer foot plant is strong, with many flowers and bright colors. Phosphorus deficiency, few and thin branches, thin petals and short flowering period. When lack of potash fertilizer, the rhododendron branches are slender and the tissue is soft. It is appropriate to apply more nitrogen and potassium fertilizer when young trees and more phosphorus fertilizer when mature trees. If the soil has been alkalized, causing the leaves to lose green and turn yellow and white, ferrous sulfate should be applied. Fat and water should not be thick. Apply thin fertilizer diligently. Excessive concentration of liquid fertilizer will burn the roots and damage the plants.

Moisture requirement

1. Cuckoos are afraid of dryness and waterlogging. If the cuckoo pot soil is too much, the root will shrink, first the leaves will droop or curl, then the tip of the young leaves will become scorched yellow, and the serious ones will not recover for a long time and die day by day. The basin soil is too wet, the ventilation is small, causing rotten roots, the light leaves are yellow and early, the growth stops, and the heavy ones die.

2. If the cuckoo pot soil is too dry and causes root damage, the salvage method is to soak the roots in the water, put them in a cool place, and spray water on the leaves many times. If the yellow leaves fall early due to excessive humidity, the damaged plants should be placed in a ventilated place, the frequency and amount of watering should be controlled, and fertilization should be stopped to prevent disease and insect infection.

3. Cuckoos like humid environment, so they should always pour some water around the basin and on the leaves to keep the surrounding environment moist. If the surrounding environment is dry, cuckoos are very susceptible to disease. The rescue method is to put the sick cuckoo into the pit under the grape and other trees, covered with glass, the pit is often sprayed with water, the grape branches and leaves can penetrate oblique light, and the diseased flowers will slowly return to normal.

Light management

Cuckoos should bask in the sun more after budding, but pay attention to avoid direct light during flowering. The strong light will dilute the flowers and make the flowers wither earlier. Scattered light is required and good ventilation is required.

Matters needing attention

1. The roots of azaleas are as thin as hair, and there are few thick taproots. They are afraid of both dry and wet, especially heavy fertilizer. If too much watering, the root is soaked in water, too dry, branches and leaves atrophy, leaf petal fall off, a great threat to the plant, as for watering heavy fertilizer, it will be life-threatening.

2. after the flower fade, the residual flowers must be cut off to avoid fruiting and wasting nutrition. after the new branches germinate, they should be thinned properly and stay according to the growth of the plant.

3. Rhododendron is most suitable to be planted in muddy basin, because the mud basin absorbs water and breathes air, which is beneficial to the growth and development of roots and luxuriant branches and leaves.

4. Potted azaleas should be placed on the southeast balcony and should be ventilated and moved as little as possible. If it is not ventilated, it is easy to suffer from black spot disease and a large number of fallen leaves.

5. Cuckoos should also have moderate requirements for light, and avoid direct light in summer. Fertilization should grasp the application of thin fertilizer frequently, can be light but not strong, and apply organic compound fertilizer on the basin soil once a month. Potassium dihydrogen phosphate was sprayed every 10 days for extra-root fertilization. Timely watering, you can also put edible vinegar in the water to increase acidity.

6. timely thinning of buds and leaves, removing part of the buds and leaves that have grown too much and too dense, so that the air is well ventilated and nutrients are concentrated on the buds. After the formation of buds, it is necessary to increase nutrition and apply more phosphorus and potassium fertilizer, otherwise the buds will be transformed into leaf buds.

7. The main reasons for azaleas falling leaves and not blooming are: too much direct light in summer, frostbite, too much watering, too thick fertilization, too long indoor time, poor air circulation or dark and humid places, acid rain, and so on. so these situations should be avoided in the process of maintenance.

8. Turning the basin and changing the soil do not need to be carried out every year, usually once every 2 to 3 years, with as little damage to the roots as possible. The time should be after the blossom fade or in autumn, and topirazine should be sprayed at the same time to prevent diseases.

9. The pests of azaleas are mainly red spiders and aphids, which can be sprayed with permethrin, and the effect is better, such as not dying after three days, spray again. The disease is mainly black spot, which is caused by muggy environment and lack of light. Measures can be taken to promote air circulation on the one hand and spray Bordeaux solution and carbendazim on the other.

10. The propagation method of rhododendron is mainly cutting. Before and after Grain in Beard, select new branches, 5 cm to 10 cm long, cut off at the bifurcation point, peel off the lower leaves, leave 3 to 4 top leaves, insert the 1x3 of the branches into the soil, spray enough water, and cover with plastic film. It is necessary to strengthen the management at ordinary times and transplant a year later.

The cultivation method of azaleas: how to raise the potted azaleas in the family?

Rhododendron is one of the top ten famous flowers in China. Among all the ornamental flowers and trees, they can be called flowers, leaves and beauty, suitable for both ground and potted plants, and the azaleas are the most widely used.

Azaleas have always been a favorite flower. I think many people have raised azaleas. Many people may not know how to cultivate azaleas. Today, I would like to introduce the relevant skills and methods of cultivating rhododendrons. I hope it can help you when cultivating azaleas.

Here's how to raise azaleas.

How to raise azaleas well? First of all, we must understand the conditions needed for its growth and development. Azaleas have "six joys" and "six taboos".

① likes to be cool and avoid extreme heat.

② likes the half shade and avoids the scorching sun.

③ prefers wetting to dryness.

④ likes acidic soil and avoids alkaline soil.

⑤ prefers light soil to clayey soil.

⑥ likes good drainage and avoids waterlogging.

After coming out of the room in spring, the sun is softer, and the azaleas should be properly shaded around noon.

After the beginning of summer, the azaleas should be put in a cool and ventilated place. in hot summer, Reed curtains, bamboo curtains and sunshade nets should be used to shade, and the curtains should be opened before 8 o'clock in the morning and after 5: 00 p.m. to 6 p.m. As the cuckoo belongs to semi-negative flowers and trees, the young leaves are easy to burn in the hot sun. If it is exposed to strong light for a long time in summer, the branches and leaves will be withered and yellow, the growth will stagnate, and the whole plant will die in serious cases.

The sun intensity in autumn gradually eased, and the azaleas could see more sunshine before 9: 00 a.m. and after 5: 00 p.m., and put in sunny places at the end of autumn to promote flower bud differentiation. The cuckoo is not hardy, so it should be moved indoors between Cold Dew and Frosts Descent and placed in a sunny place. At the beginning of entering the room, you should pay attention to opening the windows and doors for ventilation. If it is placed in the shade for a long time, it is easy to drop buds.

The suitable room temperature in winter is about 10 ℃. The room temperature of most varieties is not less than 5 ℃, but the cuckoo is afraid of cold, and the overwintering room temperature should not be lower than 8 ℃. If the room temperature is too high in winter, the metabolism is enhanced and nutrients are consumed, which is not conducive to the growth and development of the following year.

Acid soil can be used to conserve rhododendron. Because rhododendron likes acidic soil, pH4.5-6.5is suitable. It is required that the basin soil is loose, good drainage and contains humus. 6 pieces of rotten leaf soil, 2 parts of peat soil and 2 parts of river sand are commonly used to prepare or use pine needle soil. At the same time, in order to improve the quality of water, it is best to use mineral-free water, such as Rain Water or snow water. In addition to storing Rain Water and snow water, acidified water can be used, that is, 100 jin of water plus 0.1% ferrous sulfate for perennial use. If the acidity is not enough, you can supplement it with less vinegar. How to water:

(1) "trapped water" should be used, that is, the water and the cuckoo should be dried at the same temperature. Fish tank water, Rain Water, river water can also be used.

(2) if the soil is not dry or irrigated, it should not be too dry, and the leaves will wilt if it is too dry.

(3) Water must be thoroughly watered.

(4) there are differences between winter and summer. The leaves are good in winter, but it doesn't hurt to get wet in summer. Flowering period should not be more watering, too much easy to drop buds and early thanks; spring and autumn wind is dry, must be sufficient. Pay attention to spraying the leaf surface and the ground to maintain a certain degree of humidity. During the cuckoo growing period, alum fertilizer and water are generally applied every 10-15 days, or 0.1% rame0.2% potassium dihydrogen phosphate solution can be used for foliar spraying.

Note:

1. The roots of azaleas are as thin as hair, and there are few thick taproots. They are afraid of both dry and wet, especially heavy fertilizer. If too much watering, the root is soaked in water, too dry, branches and leaves atrophy, leaf petal fall off, a great threat to the plant, as for watering heavy fertilizer, it will be life-threatening.

2. after the flower fade, the residual flowers must be cut off to avoid fruiting and wasting nutrition. after the new branches germinate, they should be thinned properly and stay according to the growth of the plant.

3. Rhododendron is most suitable to be planted in a muddy basin, because the mud basin absorbs water and breathes air, which is beneficial to the growth and development of roots and luxuriant branches and leaves.

4. Potted azaleas should be placed on the southeast balcony and should be ventilated and moved as little as possible. If it is not ventilated, it is easy to suffer from black spot disease and a large number of fallen leaves.

5. Azaleas should also have moderate requirements for light, and avoid direct light in summer.

6. timely thinning of buds and leaves, removing part of the buds and leaves that have grown too much and too dense, so that the air is well ventilated and nutrients are concentrated on the buds. After the formation of buds, it is necessary to increase nutrition and apply more phosphorus and potassium fertilizer, otherwise the buds will be transformed into leaf buds.

7. The main reasons for azaleas falling leaves and not blooming are: too much direct light in summer, frostbite, too much watering, too thick fertilization, too long indoor time, poor air circulation or dark and humid places, acid rain, and so on. so these situations should be avoided in the process of maintenance.

8. Turning the basin and changing the soil do not need to be carried out every year, usually once every 2 to 3 years, with as little damage to the roots as possible. The time should be after the blossom fade or in autumn, and topirazine should be sprayed at the same time to prevent diseases.

9. The pests of azaleas are mainly military insects, terminal bud leaf rollers, red spiders, aphids, etc., which can be sprayed with permethrin, and the effect is better, such as not dying after three days, spray again. The military worm (also known as the crown net bug) sprayed 1500 times of dimethoate during the damage period, once every 7 days for 3 times in a row. The control methods of terminal bud leaf rollers are mainly killed by artificial capture, and the larvae or pupae can also be sprayed with 2000 times of dimethoate EC or 1500 times of dichlorvos.

10. The propagation method of rhododendron is mainly cutting. Before and after Grain in Beard, select new branches, 5 cm to 10 cm long, cut off at the bifurcation point, peel off the lower leaves, leave 3 to 4 top leaves, insert the 1x3 of the branches into the soil, spray enough water, and cover with plastic film. It is necessary to strengthen the management at ordinary times and transplant a year later.

Culture methods and matters needing attention of azaleas how to raise azaleas

Flower bonsai network guide: azaleas are a kind of flowers that everyone likes to grow, and it is also relatively common, but it is not easy to maintain azaleas well. Today, what the editor shares for you is an article about the cultivation methods and matters needing attention of azaleas. How to cultivate azaleas? let's have a look at the flowers who like azaleas.

Rhododendron (scientific name: rhododendron) is commonly known as rhododendron, referred to as rhododendron. Among them, also known as Yingshanhong, Manshanhong, rhododendron, rhododendron, pomegranate and other beautiful original species, such as Yingshanhong and other beautiful species is one of the top ten famous flowers in China. There are about 960 original species of Rhododendron in the world and more than 570 species in China. Azalea is the national flower of Nepal and the provincial flower of Jiangxi Province in China. It is also the city flower of Wuxi, Zhenjiang, Sanming, Changsha, Shaoguan, Dali and Jiaxing, as well as Taipei and Hsinchu in Taiwan.

Rhododendron is also known as Yingshan red, mountain red, evergreen or deciduous shrub. Originated in China, it is not only one of the top ten traditional famous flowers in China, but also one of the famous flowers in the world. Rhododendron is colorful and graceful, so it is suitable for potted plants and is also a good material for garden layout.

Rhododendron is a raceme, terminal or axillary flowers; Corolla funnel-shaped, but also trumpet-shaped, often 2-6 flowers in clusters; flowers are white, red, pink, bright red, purple, peach, orange, golden yellow and other monochromatic and complex colors; flowers have single and double flowers, florescence from April to June.

Rhododendron has strong vitality. It can withstand both drought and moisture, whether in the sun or in the shade of trees. The root is shallow, widely distributed and can be fixed on the surface soil. The most powerful thing is that it is not afraid of the dirty air in the city, because it is covered with fluffy leaves, which can not only regulate moisture, but also absorb dust. it is most suitable for growing in a metropolis with many people, cars and dirty air, and can play the function of clean air.

Like loose slightly sour soil, should not irrigate harder water. More nitrogen fertilizer should be applied in the growing season (spring and autumn). It's more hardy. Areas with lower temperatures can be kept indoors for the winter. Like a cool, humid environment. Avoid strong sunlight, keep the air moist and ensure an adequate supply of water.

There are mainly propagation methods such as sowing, cutting and grafting. The specific operation of different varieties is different.

1. Selection of flowerpots for rhododendron culture

(1) flowerpot requirements: muddy flowerpots, plastic pots, porcelain pots, pottery pots and so on can be used.

(2) the size of flowerpot: the size of flowerpot for planting rhododendron seedlings is the same as the crown diameter of seedlings, the size of flowerpot at seedling stage is 3 × 4 of its crown diameter, and the size of flowerpot at seedling stage is 1 / 2 of its crown diameter.

two。 Preparation of pot soil for rhododendron culture

Rhododendron prefers acidity (pH value 4.5-5.5), loose, well-drained soil. Avoid calcareous alkaline soil, avoid clayey soil. The formula for home cultivation is as follows: Belgian rhododendron: rotten leaf soil: peat soil: sand = 5 virtual 2vl 3; spring and summer rhododendron: garden soil: peat soil: sand = 3:5:2. Mix with proper amount of bone powder and stir evenly.

3. Temperature and light requirements of rhododendron culture

Potted rhododendrons are generally potted from March to April in spring and can also be potted in autumn. Transplant with soil when putting on the pot, and pour water into the shade after planting.

The northern potted rhododendron is generally moved indoors in the first and middle of October and placed in the sunny place after entering the house. In the early days of the room, attention should be paid to the frequent opening of windows for ventilation. The room temperature in winter should be about 10 ℃, which should not be too high, otherwise, the physiological activity of the plant will be strengthened, a large amount of nutrients will be consumed, and the flowering and growth in the coming year will be affected. At the same time, sufficient light should be given. Leave the room after the middle and late April of the following year, when the sun is softer, should be properly shaded around noon, and should be moved to a cool and ventilated place for maintenance after summer. Because rhododendron belongs to negative flowers, it needs to be maintained in the shade in spring, summer and autumn, especially in the hot sun for a long time in summer, it is easy to cause withered and yellow branches and leaves, stagnation of growth and death of the whole plant. The time of seeing light every day in autumn should be gradually lengthened, and the shading should be stopped at the end of autumn.

4. Watering method of Rhododendron Culture

Keep the basin soil moist during the growing period, need more water during the flowering period from April to June, spray water to the ground and leaves in the high temperature season from July to August, keep the air moist, cool the temperature gradually after September, gradually reduce the water content of the basin soil, and enter the dormant period in winter. Less watering should be done.

Because the root system of rhododendron is shallow, afraid of both drought and waterlogging, improper watering, light falling leaves, heavy death, therefore, watering is one of the key measures to raise juniper flowers. Watering should be determined according to the plant season and growing period. The water consumption is more in the bud and flowering period in spring, and the watering should be timely. If the pot is dehydrated, the flower will wither and the florescence will be shortened. In this period, it is appropriate to keep the basin soil moist. In summer, rhododendron branches and leaves grow vigorously, the temperature is high, and water evaporates fast. in addition to watering once a day, water should be replenished at any time. If you are a little negligent, making the basin soil too dry will cause the leaves to turn yellow, curl the leaf center, and even dry up and die.

Because the cuckoo likes to be moist, it is necessary to spray the leaves with clear water and sprinkle water on the ground around the flowerpot in summer in order to increase the air humidity and lower the air temperature. in autumn, flower buds have been formed, the temperature is dropping day by day, and the weather turns cool. at this time, keep the pot soil dry. When the temperature is low in winter, the cuckoo is dormant or semi-dormant, and the water consumption is low, so watering should be strictly controlled. Too much water is easy to rot the roots, but in this period, the branches and leaves should be sprayed with water close to room temperature every 5 to 7 days to make the plants fresh. Rhododendron watering should pay attention to the quality of water, it is more appropriate to use Rain Water, if tap water is used, it must be stored in a container for 1-2 days before use.

5. Fertilization methods for Rhododendron Culture

The roots of rhododendron are shallow and thin, and their absorptive capacity is weak, so we must grasp the principle of "thin fertilizer and diligent application" when applying fertilizer. If the fertilizer is too thick or the raw fertilizer is not fully mature, it is easy to cause rotting roots, scorched leaves and even death. Especially for 1-and 2-year-old seedlings, we should pay more attention to the amount of fertilizer, otherwise it is easy to cause fertilizer damage.

From February to March before blooming, liquid fertilizer dominated by phosphorus should be applied every 10 to 15 days to promote large flowers, and from March to April, applying the same fertilizer to summer cuckoos can make the flowers large, good color, thick petals and long flowering period. Fertilization should be stopped during flowering, otherwise it is easy to shed flowers and long leaves, which will affect the ornamental effect; after flower fade, nitrogen-based fertilizer should be applied every 10 days or so to promote new shoots. After late July, it is the period of flower bud differentiation of rhododendron. Liquid fertilizer dominated by phosphorus should be applied every 10 to 15 days to promote flower bud differentiation. No fertilizer is needed during winter dormancy, so topdressing should be stopped.

6. Pruning methods of Rhododendron Culture

Rhododendron has strong germination, many branches and dense branches. after flowering, dense branches, weak branches, withered branches, diseased branches, residual branches, cross branches and long branches should be cut off to facilitate ventilation and light. Do not cut short the reserved branches. Because the leaves of azaleas are mostly clustered at the top of the branches, a new branch and a cluster of new leaves will grow after flowering, and the old leaves will fall off immediately, and then the terminal bud begins to differentiate into flower branches in the coming year. If this branch is cut off, it will affect the number of flowers in the following year.

7. Matters needing attention in Rhododendron Culture

(1) Rhododendron is a typical acid soil flower. In order to prevent yellowing, 0.2% ferrous sulfate should be applied every 20 days. If it is found that the leaf color is yellow, spray 0.2% ferrous sulfate directly to the leaf surface, which can change the leaf from yellow to green.

(2) the family grows flowers. If you want the cuckoo to blossom during the Spring Festival, you can use the method of breaking its dormancy period. The spring cuckoo, which is about to have a bud, moves indoors to the sunny place in mid-December, keeping the room temperature above 5 ℃, applying thin fertilizer every 10 to 15 days, watering the basin soil and often spraying water on the leaves to increase humidity, so that it can blossom before the Spring Festival.

(3) the azaleas grow slowly and the pots can be changed every two years. The pots should be changed after the flowers fade. Fill in the new culture soil when changing the basin. Generally, 8 parts of rotten leaf soil (peat soil), 1 part of garden soil and 1 part of river sand were mixed and a small amount (about 50 grams per basin) of rotten oil residue or chicken manure was added as base fertilizer.

(4) during the growth period, adventitious buds are often easy to sprout on stems and branches, which should be erased in time so as not to disturb the plant type. After pregnancy, if you find that there are too many buds, you should remove the excess buds and leave only one bud per branch in order to concentrate nutrients and promote the flowers to be colorful. The residual flowers of rhododendron are not easy to fall off after flowering. In order to reduce nutrient consumption, the residual flowers should be removed in time to promote the germination of new buds.

8. Propagation methods of Rhododendron Culture

Rhododendron can be propagated by cutting, grafting and striping, mainly by cutting. The method of full-light cuttage can be used for mass propagation, which has the advantages of fast rooting and high survival rate, and can be inserted into flowerpots during a small amount of propagation. Cuttings in early summer and early autumn, shading and moisturizing after cutting.

Cutting medium, 3 pieces of rotten leaf soil, 1 part of garden soil, 6 parts of river sand mixed or 5 parts of rotten leaf soil, 5 parts of river sand (or pure sand). Cuttings should choose annual branches with short internodes, robust growth, no disease and insect pests, and Lignification at the base, and the cuttings are 6-10 cm long. Put medical vitamin B12 at the base of the cuttings before cutting. Dip it in the liquid, take it out and hang it for 2-3 minutes, take root early for about 10 days, and take root more and grow fast.

When cutting, first use chopsticks or sticks to make a hole in the substrate, and then insert the cuttings, gently compacted with hands and sprayed with water, so that the base of the cuttings is closely combined with the soil. After planting, cover the flowerpot with a plastic bag, tie it around with string and put it in the shade; spray water once a day in the morning and evening, stop spraying water after a week, just keep the pot soil moist; keep shade within a month, gradually accept scattered light after germination; keep the temperature at 18-25 degrees Celsius. General varieties can take root after 40-60 days of cutting.

When raising flowers in the family, in order to bloom early, the method of high branch pressing can also be used to propagate. That is to say, the sturdy branches of 2 ~ 3 years old are selected for ring peeling in March, covered with plastic bags and filled with rotten leaf soil, which are often kept moist. The temperature is about 20-25 degrees Celsius, it can take root in about 5-6 months, and it can blossom in the following spring. 2014-5-15

The key to raising azaleas well

Rhododendron is one of the top ten famous flowers in China, which is suitable for potted and ground planting. As a kind of high-grade flowers and trees, potted rhododendron has been introduced into thousands of families and occupies an important proportion in the production and sales of traditional annual flowers in China. How can we raise it well? To raise azaleas well, we must first understand the conditions needed for its growth and development. Azaleas have "six joys" and "six taboos", that is, ① likes cool, avoid heat; ② likes semi-shade, avoid scorching sun; ③ likes moist, avoid dry; ④ likes acidic light soil, avoid alkaline clay heavy soil; ⑤ likes light fertilizer, avoid concentrated fertilizer; ⑥ likes good drainage and avoid waterlogging. According to their ecological habits, we should strive to create conditions suitable for their fertility, and conscientiously do a good job in the following conservation and management work.

(1) to raise cuckoos in pots and turn pots, it is appropriate to choose plain-fired tile pots, the size of which depends on the seedlings and should not be too large, in order to "once and for all", otherwise it will be counterproductive. Do not choose the basin too deep, so that the root system can not be exposed. The pots were changed every 1-2 years in the seedling stage, and the pots of mature seedlings were changed every 3-4 years. Rhododendron has higher requirements for potted soil, which must be acidic and well drained, and pine needle soil is the most ideal. It can also be prepared with 3 parts of rotten leaf soil or peat soil or mountain mud, 1 part of river sand, and a small amount (about 50 grams per basin) of sesame sauce residue and bone meal as base fertilizer. When planting, the bottom of the basin should be covered with tiles and coarse sand to facilitate drainage. The seedlings must have intact soil masses when potting and turning them. Once the soil masses are scattered, it is difficult to survive after planting.

(2) watering azaleas are afraid of both dryness and waterlogging, like wetting and stagnant water, watering should be timely and appropriate, and avoid alkaline water quality: azaleas like to spray water on their leaves and around them every time they are watered to maintain a relative humidity of more than 80%. Watering during the flowering period should not be too much, and the water will wither the flowers early, let alone spray water on the flowers, but drought will also distract the flowers and shorten the flowering period. Most of the groundwater or tap water in the northern area is neutral or alkaline, so the ferrous sulfate liquid or alum fertilizer water should be irrigated regularly to keep the basin soil acidic, which is one of the key measures to cultivate azaleas in the northern area. Water less during the dormant period and keep the basin soil dry.

(3) fertilizing rhododendron likes fertilizer, and it is suitable to apply thin fertilizer frequently and avoid thick fertilizer. After the flower fade in spring, the liquid fertilizer dominated by nitrogen fertilizer should be applied for 2 or 3 times, each time with an interval of about 10 days, so as to promote more new branches and leaves, and proper amount of potassium dihydrogen phosphate should be added to the cake fertilizer water during the period of flower bud differentiation from June to August, which is helpful to flower bud differentiation and flower bud development. No fertilizer is needed during winter dormancy. From February to March before flowering, spring cuckoo can be re-applied mainly with phosphate fertilizer, and the thin fertilizer combined with phosphorus and nitrogen can be applied twice. Summer cuckoos can be given the same fertilizer from March to April, which can make the flowers large, bright color and long flowering period. Fertilization should be stopped during flowering, otherwise it is easy to fall flowers and long leaves and affect the ornamental value.

(4) from the end of spring to autumn, the sun is strong, which is disadvantageous to the growth of rhododendron, especially the rhododendron, which will make the branches and leaves withered and yellow, growth stagnant, easy to burn and aging. So starting from May, shading will be carried out to maintain a light transmittance of 40% to 60%. Sunshine and night dew can be accepted sooner or later. Protect yourself from the sun in summer and spray water every day to moisturize and cool down. The light can no longer be shaded at the end of autumn, which is beneficial to the growth and enrichment of plant tissue.

(5) in the first and middle of October, the cuckoo should be moved indoors, and good ventilation should be maintained to avoid gas pollution. Rhododendron and oriental cuckoo should keep the indoor temperature not lower than 10 ℃. If they encounter low temperature, they will suffer from cold injury and cause defoliation. If the room temperature is too high, it will cause plants to germinate prematurely, consume nutrients, and affect flowering and growth in the following year. Therefore, on a sunny day, open the window to cool down.

(6) during the growth of pruned rhododendron, adventitious buds are easy to sprout on stems and branches, which should be erased in time. After flowering, the residual flowers should be cut off in time to promote the germination of new buds. Combine to change the basin, cut off the dense branches, thin and weak branches, long branches, disease and insect branches, etc., in order to facilitate ventilation and light.

(7) Disease and pest control of rhododendron if the environment is not suitable and improper conservation, it is often easy to cause diseases and insect pests, so it should be prevented and controlled in time.

Why rhododendron buds are easy to wither and rot

Rhododendron does not open more buds than shrunken and withered, and poor nutrition supply of buds is the main reason for rhododendron withering. The causes of poor nutrition supply are:

(1) be frozen

Rhododendron is afraid of low temperature. if it is injured in the blooming stage of pregnant buds, it will weaken the growth potential and decrease the ability of root system to absorb water and fertilizer. The buds are withered and withered due to insufficient supply of nutrients. Therefore, azaleas should pay attention to maintain a certain temperature during budding.

(2) improper fertilization

Rhododendron has many buds and has a great demand for fertilizer, but if there is insufficient supply of fertilizer or too much nitrogen fertilizer during budding, it will cause branches and leaves to grow, compete with buds for nutrients, and often lead to the phenomenon that buds do not bloom. Therefore, when cultivating rhododendron, it is necessary to increase the supply of phosphorus and potassium fertilizer and reduce the supply of nitrogen fertilizer from flower bud differentiation.

Another reason is that the rooting fertilizer is too thick to burn the roots, causing the buds to dry up due to insufficient nutrient supply, and the drying up of the buds caused by rooting is accompanied by a large number of fallen leaves. The root system of rhododendron is small, so we should pay attention to the application of thin fertilizer when fertilizing rhododendron, otherwise it is easy to burn roots.