How to Grow Potted Azaleas at Home: Care Methods and Precautions

Growing Techniques Jan 1, 1970 0 views

Azalea, also known as shan zhizhu, shan shiliu, or yingshanhong, is a deciduous shrub in the Ericaceae family. There are approximately 900 species of azaleas worldwide, and China is the country with the most azalea species, with around 530. Azaleas are extremely varied, with brilliant flower colors and both beautiful flowers and foliage, suitable for both ground planting and potting.

Soil Requirements

To make azaleas bloom beautifully, you must first understand the soil of their growing environment: the pH value should be between 5.5 and 6.5, and alkaline or clayey soil must be avoided. The suitable growing temperature is 12°C to 25°C. In summer, shade them from the sun; in winter, protect them from freezing and keep them warm, preferably moving them indoors. Following the details described above and cultivating them carefully, azaleas will surely bloom beautifully. Azaleas like fertile soil. Acidic humus soil formed from years of accumulated and decomposed dead branches and fallen leaves is most suitable for growing azaleas. Clay soil has poor permeability and poor drainage and should not be used, especially soil containing lime, which must never be used.

Fertilization Methods

When topdressing, do not apply alkaline fertilizer water. Burying rancid fats such as lard into the soil can make azaleas grow vigorously, bloom more, and produce vivid flower colors. Correctly use nitrogen, phosphorus, and potassium fertilizers. Sufficient nitrogen fertilizer gives dark green leaves and vigorous growth. Insufficient nitrogen fertilizer results in pale, lusterless leaves, thin and aged-looking leaves, short and weak branches, and few and small flowers; excessive nitrogen fertilizer will cause excessive vegetative growth. Sufficient phosphorus fertilizer gives strong plants, more flowers, and brilliant flower colors. Insufficient phosphorus results in few and weak branches, thin petals, and a short flowering period. When potassium fertilizer is lacking, azalea branches become slender and the tissues soft. Apply somewhat more nitrogen and potassium fertilizer when the plant is young, and more phosphorus fertilizer when mature. If the soil has already become alkaline, causing leaf chlorosis with yellow-white discoloration, additional ferrous sulfate should be applied. Fertilizer water should not be too concentrated. Apply thin fertilizer frequently. Liquid fertilizer that is too concentrated will burn the root system and harm the plant.

Water Requirements

1. Azaleas fear both drought and waterlogging. If the potting soil of an azalea is too dry, the root tips will shrink, and the leaves will first droop or curl, after which the tips of the young leaves turn scorched yellow; in severe cases, the plant cannot recover for a long time and gradually withers and dies. If the potting soil is too wet, aeration is poor, causing root rot; in mild cases the leaves turn yellow and fall early and growth stalls, and in severe cases the plant dies.

2. If the azalea's potting soil is too dry and the roots are damaged, the remedy is to soak the whole pot and roots in water, place it in a cool place, and spray the leaves with water several times. If excessive moisture causes yellow leaves to fall early, place the affected plant in a ventilated spot, control the frequency and amount of watering, and stop fertilizing to prevent pest and disease infection.

3. Azaleas like a humid environment, so water should often be sprinkled around the pot and on the leaf surface to keep the surrounding environment moist. If the surrounding environment is dry, azaleas are very susceptible to disease. The remedy is to place the affected azalea in a pit beneath grapevines or similar trees, cover it well with glass, spray water frequently in the pit, and since slanting light can penetrate through the grape branches and leaves, the diseased plant will slowly return to normal.

Light Management

After azaleas form flower buds, they need more sunlight, but during the flowering period care must be taken to avoid direct strong light, which will fade the flower color and make the flowers wither prematurely. Diffused light is required, along with good ventilation.

Precautions

1. Azalea roots are as fine as hair strands, with very few thick main roots. They fear both drought and moisture, and especially fear heavy fertilizer. If watered too much, the roots soak in water; if too dry, the branches and leaves shrink and the leaves drop, posing a great threat to the plant; and applying heavy fertilizer will endanger its life.

2. After the flowers fade, the spent flowers must be cut off to avoid seed production consuming nutrients. After new branches sprout, thin the branches appropriately, deciding what to keep or remove based on the plant's growth vigor.

3. Azaleas are best planted in clay pots, because clay pots absorb water and breathe, which benefits root growth and development and produces lush branches and leaves.

4. The placement of potted azaleas matters; they should generally be placed on a southeast-facing balcony, and they need ventilation and should be moved as little as possible. Without ventilation, they are prone to black spot disease and will drop leaves in large numbers.

5. Azaleas' light requirements should also be moderate; avoid direct light in summer. For fertilization, master the principle of thin fertilizer applied frequently; dilute rather than concentrate. Apply organic compound fertilizer to the potting soil once a month. Spray potassium dihydrogen phosphate once every 10 days as a foliar feed. Water in a timely manner, and you can also add edible vinegar to the water to increase acidity.

6. Thin buds and leaves in a timely manner, removing part of the flower buds and leaves that have grown too numerous and too dense, so that air can circulate and nutrients concentrate in the flower buds. After the flower buds form, increase nutrition and apply a moderate amount of extra phosphorus and potassium fertilizer; otherwise the flower buds will transform into leaf buds.

7. The main reasons for azalea leaf drop and failure to bloom are: excessively strong direct light in summer, freezing damage from severe cold, too much watering, fertilizer that is too concentrated, being kept indoors too long, being placed in a place with no air circulation or that is dark and damp, and exposure to acid rain. Therefore, these situations should be avoided during care.

8. Repotting and changing the soil does not need to be done every year; generally once every 2 to 3 years. Damage the roots as little as possible, and the timing should be after the flowers fade or in autumn. At the same time, spray thiophanate to prevent disease.

9. The main pests of azaleas are red spider mites, aphids, and so on, which can be sprayed with fenvalerate and similar products with good results; if they are not dead after three days, spray again. The main disease is black spot, caused by a stuffy, hot environment and lack of light. Measures can be taken to promote air circulation on the one hand and spray Bordeaux mixture or carbendazim on the other.

10. Azalea propagation is mainly by cuttings. Around the time of Mangzhong (Grain in Ear), select new branches 5 cm to 10 cm long, cut them at the branching point, strip off the lower leaves, keep 3 to 4 leaves at the top, insert one-third of the branch into the soil, spray with plenty of water, and cover with plastic film. Strengthen management as usual, and transplant after one year.

Azalea Growing Methods: How Should Potted Azaleas Be Grown at Home?

Azalea is one of China's ten famous flowers. Among all ornamental flowering trees and shrubs, the one that can be called both beautiful in flower and foliage, suitable for both ground planting and potting, and the most widely used, is the azalea.

Azaleas have always been a popular flower that everyone likes, and many people must have grown azaleas. But many people may not be very clear about how to grow azaleas. Today I will introduce the relevant tips and methods for growing azaleas, hoping to help everyone when growing azaleas.

Here is how to grow azaleas well

How do you grow azaleas well? First you need to understand the conditions required for their growth and development. Azaleas have the "six likes" and the "six taboos."

① Likes coolness, taboos intense heat

② Likes semi-shade, taboos blazing sun

③ Likes moisture, taboos dryness

④ Likes acidic soil, taboos alkaline soil

⑤ Likes light-textured soil, taboos heavy clay soil

⑥ Likes good drainage, taboos waterlogging.

After being brought outdoors in spring, when the sunlight is relatively soft, azaleas should be appropriately shaded around midday.

After summer begins, place azaleas in a ventilated, cool spot. In the hot summer, shade them with reed curtains, bamboo curtains, or shade netting, and lift the curtains before 8 a.m. and after 5-6 p.m. Since azaleas are semi-shade-loving flowering shrubs, young leaves are easily scorched under blazing sun. If kept under strong direct light for a long time in summer, the branches and leaves will turn yellow and withered, growth will stall, and in severe cases the whole plant will die.

In autumn, when sunlight intensity gradually softens, azaleas can be given more sunlight before 9 a.m. and after 5 p.m. In late autumn, place them in a sunny spot to promote flower bud differentiation. Azaleas are not cold-hardy and should be moved indoors around the time between Hanlu (Cold Dew) and Shuangjiang (Frost's Descent), placed in a sunny spot. In the early period after moving indoors, take care to open the windows for ventilation. If kept in a shaded place for a long time, they tend to drop their buds.

In winter, a room temperature of around 10°C is suitable. For most varieties, room temperature should not be lower than 5°C, but Western azaleas are sensitive to cold, and their overwintering room temperature must not be lower than 8°C. If the winter room temperature is too high, metabolism increases, nutrients are consumed, and this is unfavorable for growth and development the following year.

Acidic soil can be used for growing azaleas. Because azaleas like acidic soil, a pH of 4.5-6.5 is suitable. The potting soil is required to be loose, well-drained, and rich in humus. A commonly used mix is 6 parts leaf mold, 2 parts peat soil, and 2 parts river sand, blended evenly, or pine needle soil can be used. At the same time, to improve water quality, the water used for watering flowers is best free of minerals, such as rainwater or snow water. Besides storing rainwater and snow water, acidified water can be used, that is, 100 jin of water with 0.1% ferrous sulfate added, used for watering year-round. If the acidity is insufficient, add a little edible vinegar to supplement it. How to water:

(1) Use "aged water," that is, let the water sit and be exposed to the sun at the same temperature as the azalea. Water from a fish tank, rainwater, or river water can also be used.

(2) Do not water if the soil is not dry; do not let it get too dry when it is dry, as the leaves will wilt if it is too dry.

(3) When watering, water thoroughly.

(4) Winter and summer are different. In winter, as long as the leaves are fine, it does not hurt to be a bit wetter in summer. During the flowering period, do not water too much, as too much easily causes bud drop and early withering; in spring and autumn, when it is windy and the air is dry, a sufficient supply must be guaranteed. Take care to spray the leaf surface and the ground to maintain a certain humidity. During the azalea's growing period, generally apply alum fertilizer water once every 10-15 days, and alternately spray the leaves with a 0.1%-0.2% potassium dihydrogen phosphate solution.

Precautions:

3. Azaleas are best planted in clay pots, because clay pots absorb water and breathe, which benefits root growth and development and produces lush branches and leaves.

5. Azaleas' light requirements should also be moderate; avoid direct light in summer.

9. The main pests of azaleas are the azalea lace bug, the shoot-tip leaf roller, red spider mites, aphids, and so on, which can be sprayed with fenvalerate and similar products with good results; if they are not dead after three days, spray again. For the azalea lace bug (also known as the azalea lace bug, Stephanitis), during the damage period spray a 1500-fold dilution of 40% dimethoate, once every 7 days, for 3 consecutive times. Control of the shoot-tip leaf roller mainly relies on manual capture and killing; the larvae or pupae can also be killed by spraying a 2000-fold dilution of 40% dimethoate emulsifiable concentrate or a 1500-fold dilution of dichlorvos.

Azalea Growing Methods and Precautions: How to Grow Azaleas

Flower Bonsai Network introduction: Azalea is a flower that everyone relatively likes to grow and is also fairly common, but growing azaleas well is not easy. Today the editor shares with you an article about azalea growing methods and precautions, and how to grow azaleas well. Flower lovers who like azaleas, come and take a look.

Plants of the genus Rhododendron (scientific name: Rhododendron) are commonly known as azaleas, or rhododendron for short. Among them, the beautiful original species also known as yingshanhong, manshanhong, shan zhizhu, hong zhizhu, shan shiliu, and so on, such as yingshanhong and other beautiful species, are among China's ten famous flowers. There are approximately 960 original species of Rhododendron worldwide, with more than 570 species within China. The azalea is the national flower of Nepal, the provincial flower of Jiangxi Province, China, and also the city flower of Wuxi, Zhenjiang, Sanming, Changsha, Shaoguan, Dali, and Jiaxing, as well as the city flower of Taipei and Hsinchu in Taiwan, China.

Azalea, also known as yingshanhong or manshanhong, is an evergreen or deciduous shrub. Native to China, it is one of China's ten traditional famous flowers and also one of the world's famous flowers. Azaleas have brilliant colors and graceful forms, suitable for potted viewing and also good material for garden landscaping.

The azalea has a raceme inflorescence, with flowers terminal or axillary; the corolla is mostly funnel-shaped, and also trumpet-shaped, often with 2-6 flowers clustered together; flower colors include white, red, pink, bright red, purple-red, peach-red, orange-yellow, golden-yellow, and other single colors and compound colors; flowers are single-petaled and double-petaled, with a flowering period from April to June.

Azaleas have very strong vitality, tolerating both drought and moisture, and can adapt whether in full sun or under tree shade. Their roots are shallow and widely spread, able to anchor in the surface soil. Most impressive is that they are not afraid of the polluted air of cities, because their leaves are covered with fine hairs, which can both regulate moisture and trap dust, making them most suitable for planting in large cities with many people, many cars, and polluted air, where they can perform the function of purifying the air.

They like loose, slightly acidic soil and should not be watered with water of relatively high hardness. During the growing season (spring and autumn), more nitrogen fertilizer should be applied. They are relatively cold-tolerant. In areas with lower temperatures, they can be kept indoors over winter. They like a cool, moist environment. Strong sunlight should be avoided, the air should be kept humid, and a sufficient supply of water should be ensured.

The main propagation methods are sowing, cuttings, and grafting. The specific operations differ for different varieties.

1. Choosing Flower Pots for Growing Azaleas

(1) Pot material requirements: clay pots, plastic pots, porcelain pots, ceramic pots, and so on can be used.

(2) Pot size: the pot size for planting azalea seedlings should match the crown diameter of the seedling; the pot size for planting azaleas at the mid-seedling stage should be 3/4 of their crown diameter; the pot size for azaleas at the mature seedling stage should be 1/2 of their crown diameter.

2. Potting Soil Preparation for Growing Azaleas

Azaleas like acidic (pH 4.5-5.5), loose, well-drained soil. Avoid alkaline soil containing lime; avoid clayey soil. For home cultivation, the following formulas can be used: Belgian azalea: leaf mold : peat soil : sand = 5:2:3; spring-summer azalea: garden soil : peat soil : sand = 3:5:2. Mix in an appropriate amount of bone meal and stir evenly.

3. Temperature and Light Requirements for Growing Azaleas

Potted azaleas are generally potted in spring from March to April, or they can be potted in autumn. When potting, transplant with the soil ball, and after planting, water thoroughly and place in a shaded spot.

Potted azaleas in the north are generally moved indoors to overwinter in early to mid-October, and placed in a sunny spot after being brought indoors. In the early period after moving indoors, take care to open the windows frequently for ventilation. In winter, a room temperature of around 10°C is suitable and should not be too high; otherwise, the plant's physiological activity increases, consuming large amounts of nutrients and affecting flowering and growth the following year; at the same time, sufficient light should be provided. After mid-to-late April of the following year, move them outdoors. At this time the sunlight is relatively soft, and appropriate shading should be provided around midday. After summer begins, they must be moved to a cool, ventilated place for care. Since azaleas are shade-loving flowers, they need to be cared for under a shade canopy in spring, summer, and autumn. Especially in summer, being under blazing sun for a long time easily causes the branches and leaves to turn yellow and withered, growth to stall, and the whole plant to die. In autumn, the daily light exposure time should be gradually lengthened, and shading should stop by late autumn.

4. Watering Methods for Growing Azaleas

During the growing period, keep the potting soil moist. From April to June, during the flowering period, the water requirement is relatively large. In the high-temperature season of July to August, spray water on the ground and leaf surface to keep the air humid. After September, as the temperature gradually cools, the moisture in the potting soil should be gradually reduced. In winter, when the plant enters dormancy, water less.

Because the azalea's root system is shallow, it fears both drought and waterlogging. Improper watering will, in mild cases, cause leaf drop and, in severe cases, death. Therefore, watering is one of the key measures for growing azaleas well. Watering should be determined according to the plant's season and growth stage. In spring, during the bud-forming and flowering periods, water consumption is relatively high, so watering should be timely; if the pot becomes dehydrated, the flowers will wilt and the flowering period will shorten. During this period, keeping the potting soil moist is appropriate. In summer, azalea branches and leaves grow vigorously, the temperature is high, and water evaporates quickly, so besides watering thoroughly once a day, water should be replenished at any time; if there is even a slight lapse, allowing the potting soil to become too dry will cause the leaf color to turn yellow, the leaf centers to curl, and even withering and death.

Because azaleas like moisture, in summer use clean water to spray the leaf surface and sprinkle water on the ground around the flower pot, to achieve the purpose of increasing air humidity and lowering the temperature; in autumn the flower buds have already formed, the temperature gradually drops, and the weather turns cooler, so at this time just keep the potting soil from drying out; in winter the temperature is low, and azaleas are in a dormant or semi-dormant state, consuming little water, so watering should be strictly controlled, as too much water easily causes root rot, but during this period the branches and leaves should be spray-washed once every 5-7 days with clean water close to room temperature, to help keep the plant fresh. When watering azaleas, pay attention to water quality; rainwater is more suitable. If using tap water, it must first be stored in a container for 1-2 days before use.

5. Fertilization Methods for Growing Azaleas

Azalea roots are shallow and fine, with weak absorption capacity, so when fertilizing, the principle of "thin fertilizer applied frequently" must be mastered. If the fertilizer is too concentrated or undecomposed raw fertilizer is applied as a topdressing, it easily causes root rot, scorched leaves, and even death. Especially for 1-2 year old small seedlings, even more attention should be paid to the fertilizer amount, otherwise fertilizer damage is easily caused.

In February to March before spring azaleas bloom, apply a phosphorus-based liquid fertilizer once every 10-15 days to promote larger and more vivid flowers; in March to April, apply the same fertilizer to summer azaleas, which can make the flowers large, the color good, the petals thick, and the flowering period long. Fertilization should stop during the flowering period; otherwise, flowers easily drop and leaves grow, affecting the ornamental effect; after the flowers fade, apply a nitrogen-based fertilizer once about every 10 days to promote new branch growth. After late July, this is exactly the period of azalea flower bud differentiation, so apply a phosphorus-based liquid fertilizer once every 10-15 days to promote flower bud differentiation. During the winter dormant period, no fertilizer is needed, and topdressing should stop.

6. Pruning Methods for Growing Azaleas

Azaleas have strong sprouting ability and many dense branches. After flowering, cut off overly dense branches, thin and weak branches, dead branches, diseased branches, damaged branches, crossing branches, and excessively vigorous branches to facilitate ventilation and light penetration. Do not shorten the branches that are kept. This is because azalea leaves mostly cluster at the branch tips. After flowering, a section of new branch grows and a cluster of new leaves emerges, the old leaves then fall off, and then the terminal buds begin flower bud differentiation, becoming next year's flowering branches. If this section of branch is cut off, it will affect the number of flowers the following year.

7. Precautions for Growing Azaleas

(1) Azaleas are a typical acidic-soil flower. To prevent chlorosis, apply 0.2% ferrous sulfate once about every 20 days. If the leaf color is found to be turning yellow, spray the leaf surface directly with 0.2% ferrous sulfate water, and the leaves will turn from yellow to green.

(2) For home flower growing, if you want azaleas to bloom at Spring Festival, you can use the method of breaking their dormant period. That is, move spring azaleas that have already formed buds indoors to a sunny spot in mid-December, keep the room temperature above 5°C, apply thin fertilizer once every 10-15 days, water when the potting soil is dry, and frequently spray water on the leaf surface to increase humidity; in this way they can bloom before Spring Festival.

(3) Azaleas grow relatively slowly, so generally the pot can be changed once every two years, and repotting should be done after the flowers fade. When repotting, fill in new growing medium. A commonly used growing medium is 8 parts leaf mold (peat soil), 1 part garden soil, and 1 part river sand, mixed and prepared, with a small amount (about 50 grams per pot) of decomposed oil residue or chicken manure added as base fertilizer.

(4) During the growth period of azaleas, adventitious buds often easily sprout on the stems and branches, and these should be removed in a timely manner to avoid disrupting the plant's shape. After bud formation, if too many flower buds are found, remove the excess flower buds, keeping only one flower bud per flowering branch, so as to concentrate nutrients and promote large flowers and vivid colors. After azaleas bloom, the spent flowers do not easily fall off. To reduce nutrient consumption, the spent flowers should be removed in a timely manner to promote new bud sprouting.

8. Propagation Methods for Growing Azaleas

Azaleas can be propagated by cuttings, grafting, and layering, with cuttings being the main method. For mass propagation, the full-light cutting seedling method can be used, with fast rooting and a high survival rate; for small-scale propagation, they can be inserted into flower pots. Take cuttings in early summer and early autumn, and after inserting, shade and keep moist.

For the cutting medium, mix 3 parts leaf mold, 1 part garden soil, and 6 parts river sand evenly, or use 5 parts leaf mold and 5 parts river sand (or pure sand). The cuttings should be selected from one-year-old branches with short internodes, robust growth, no pest or disease damage, and a woody base, with a cutting length of 6-10 cm. Before cutting, dip the base of the cutting into medical vitamin B12 solution, take it out and let it air-dry for 2-3 minutes; this can advance rooting by about 10 days, and also produces more roots and faster growth.

When cutting, first use chopsticks or a thin wooden stick to poke a hole in the medium, then insert the cutting, press gently with your hand to firm it, spray thoroughly with water, so that the base of the cutting and the soil are closely combined. After inserting, cover the flower pot with a plastic bag, tie it tightly around with fine string, and place it in a shaded spot; spray water once each morning and evening, stop spraying after one week, and simply keep the potting soil moist frequently; maintain shading within one month, and after sprouting gradually accept diffused light; keep the temperature at 18-25°C. For common varieties, roots can form 40-60 days after cutting.

For home flower growing, to make them bloom earlier, the air-layering method can also be used for propagation. That is, in March select robust 2-3 year old branches and girdle them, cover with a plastic bag, put leaf mold inside the bag, keep it moist frequently, with a temperature of around 20-25°C; after about 5-6 months roots can form, and they can bloom in the spring of the second year. 2014-5-15

Key Tips for Growing Azaleas Well

Azalea is one of China's ten famous flowers, suitable for both potting and ground planting. Potted azaleas, as a high-grade flowering shrub, have been introduced into thousands of households and occupy an important share in China's traditional New Year flower production and sales. How can you grow them well? To grow azaleas well, you must first understand the conditions required for their growth and development. Azaleas have the "six likes" and "six taboos," namely: ① Likes coolness, taboos intense heat; ② Likes semi-shade, taboos blazing sun; ③ Likes moisture, taboos dryness; ④ Likes acidic light-textured soil, taboos alkaline heavy clay soil; ⑤ Likes dilute fertilizer, taboos concentrated or raw fertilizer; ⑥ Likes good drainage, taboos waterlogging. According to their ecological habits, strive to create conditions suitable for their growth, and carefully do the following maintenance and management tasks.

(1) Potting and repotting. For growing azaleas, unglazed clay pots are preferable. The pot size depends on the seedling and must not be too large, in an attempt to "get it done once and for all," otherwise the result is the opposite. When choosing a pot, avoid one that is too deep; as long as the root system is not exposed, it is fine. During the seedling stage, change the pot once every 1-2 years; for mature plants, repot once every 3-4 years. Azaleas have relatively high requirements for potting soil, which must be acidic and well-drained, with pine needle soil being most ideal. You can also use 3 parts leaf mold, peat soil, or mountain soil, plus 1 part river sand, prepared together, and add a small amount (about 50 grams per pot) of sesame paste residue, bone meal, and so on as base fertilizer. When planting, place more tile pieces and coarse sand at the bottom of the pot to facilitate drainage. When potting seedlings and repotting, they must be kept with an intact soil ball; once the soil ball crumbles, it will be very difficult to survive after planting.

(2) Watering. Azaleas fear both drought and waterlogging; they like moisture and fear water accumulation. Watering must be timely and appropriate, and the water quality must be prevented from being alkaline. Azaleas like their leaf surface sprayed with water; each watering should also spray water on the leaf surface and surroundings, to maintain a relative humidity above 80%. During the flowering period, do not water too much; too much water will make the flowers wither early, and water must not be sprayed on the flowers, but drought will also make the flowers listless and shorten the flowering period. Groundwater or tap water in northern regions is mostly neutral or slightly alkaline, so ferrous sulfate solution or alum fertilizer water should be watered regularly, which can keep the potting soil acidic; this is one of the key measures for growing azaleas well in northern regions. During the dormant period, water less; just keep the potting soil from drying out.

(3) Fertilization. Azaleas like fertilizer, and thin fertilizer should be applied frequently; concentrated fertilizer is taboo. In spring after the flowers fade, apply nitrogen-based liquid fertilizer 2-3 times in a timely manner, with an interval of about 10 days each time, to promote the growth of many new branches and leaves. From June to August, during the flower bud differentiation stage, add an appropriate amount of potassium dihydrogen phosphate to the cake fertilizer water, which helps flower bud differentiation and flower bud development. No fertilizer is needed during the winter dormant period. For spring azaleas, in February to March before flowering, apply 1-2 more times of thin fertilizer mainly of phosphorus fertilizer combined with phosphorus and nitrogen. For summer azaleas, apply the same fertilizer in March to April, which can make the flowers large, the color vivid, and the flowering period long. Fertilization should stop during the flowering period; otherwise, flowers easily drop and leaves grow, affecting the ornamental value.

(4) Shading and heat protection. From late spring to after autumn, sunlight is strong, which is unfavorable for azalea growth, especially for Western azaleas, as it will cause the branches and leaves to turn yellow and withered, growth to stall, and easy scorching and aging. So starting from May, shading should be carried out, maintaining a light transmittance of 40%-60%. In the morning and evening, they can receive sunlight and night dew. In summer, protect against the western sun, and spray water every day to increase humidity and lower temperature. By late autumn, shading can be stopped, to help the plant's tissues grow fully.

(5) Overwintering. In early to mid-October, move azaleas indoors, and maintain good ventilation conditions, avoiding pollution such as coal gas. Western azaleas and Eastern azaleas should keep the indoor temperature no lower than 10°C; if they encounter low temperatures, they will suffer cold damage and drop leaves; if the room temperature is too high, it will cause the plant to sprout prematurely, consume nutrients, and affect flowering and growth the following year. Therefore, on sunny days, open the windows to ventilate and lower the temperature.

(6) Pruning. During the growth period of azaleas, adventitious buds often easily sprout on the stems and branches; remove them promptly when found. After flowering, promptly cut off the spent flowers to promote new bud sprouting. In conjunction with repotting, cut off overly dense branches, thin and weak branches, excessively vigorous branches, diseased and pest-damaged branches, and so on, to facilitate ventilation and light penetration.

(7) Pest and disease control. If the environment is unsuitable and care is improper, azaleas often easily suffer pest and disease damage, which should be controlled promptly.

Why Azalea Flower Buds Easily Shrivel and Rot

When azaleas do not bloom, their flower buds mostly shrivel and rot. Poor nutrient supply to the flower buds is the main reason for azalea shriveling. The factors causing poor nutrient supply are:

(1) Freezing

Azaleas fear low temperatures. If they suffer cold damage during the bud-forming and flowering period, it will cause growth vigor to weaken and the root system's ability to absorb water and fertilizer to decline. Because the nutrient supply to the flower buds is insufficient, they shrivel and rot. Therefore, azaleas should maintain a certain temperature during the bud-forming period.

(2) Improper Fertilization

Azaleas have many flower buds and a large demand for fertilizer, but if the fertilizer supply is insufficient during the bud-forming period or there is too much nitrogen fertilizer, it will cause the branches and leaves to grow excessively, competing with the flower buds for nutrients, often leading to the phenomenon of buds forming but not opening. Therefore, when growing azaleas, from the start of flower bud differentiation, the supply of phosphorus and potassium fertilizer should be increased and the supply of nitrogen fertilizer reduced.

Another reason is that fertilizer that is too concentrated burns the roots, causing insufficient nutrient supply to the flower buds and thus drying them out. Flower bud drying caused by root burn is also accompanied by a large amount of leaf drop. Azalea roots are fine and small, so when fertilizing azaleas, care should be taken to apply thin fertilizer frequently; otherwise, root burn is very likely to occur.