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Rhododendron cultivation techniques: ten attention
Azaleas are sensitive to strong sunlight, as direct exposure can cause burns. However, excessive shading may lead to poor growth and difficulty in forming flower buds. They thrive best in slightly acidic soil with a pH around 6. If the soil is too alkaline, the leaves will gradually turn yellow from the bottom up and may eventually wither and die.
Physiological iron deficiency can also be an issue, as it affects chlorophyll production, resulting in smaller, pale yellowish-white leaves. These plants generally cannot tolerate temperatures below 10°C, and their shallow root systems make them vulnerable to heat and humidity. They prefer high air humidity, ideally between 70% and 90%.
Watering should be done carefully. Overwatering can lead to root damage, causing old leaves to drop prematurely, while underwatering may result in yellowing new leaves or drooping petals during flowering. Lack of water can also cause the center of the leaves to curl and turn yellow.
Nutrient deficiencies can also affect azaleas. A lack of nitrogen results in thin leaves, weak branches, and small, sparse flowers. Phosphate deficiency may cause reddish-purple leaves that fall easily, while potassium deficiency leads to gray-green older leaves with yellow spots that may eventually turn brown and dry out.
Over-fertilization can be harmful, causing reverse osmosis in the roots. This leads to shriveled fibrous roots, loss of leaf luster, and eventual leaf drop. Poor ventilation can cause leaves to fall due to blocked air circulation.
Azaleas are also sensitive to frost and snow. During winter, an ideal temperature is around 8°C. If kept in a room that's too warm, they won't go into dormancy properly, continuing to use nutrients and affecting their growth for the following season.
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Rhododendron cultivation techniques: ten attention