Rhododendrons, a delicate flower known as the "Bloom of Flowers", occupy an important place in many homes and gardens. However, many friends may encounter the problem of yellowing of rhododendron leaves in the process of maintenance, and the first thing that many people think of is yellowing caused by iron deficiency. In fact, the reason behind the yellow leaves of rhododendrons is far more than iron deficiency, and factors such as light and humidity also play a key role. This article will detail the various causes of yellow azaleas and provide targeted countermeasures to bring your rhododendron back to life.
Symptoms and causes of iron deficiencyWhen the rhododendron is deficient in iron, the leaves will first appear yellowing on the new leaves, which is manifested as the veins of the young leaves remain green, but the mesophyll part is pale yellow or white. This is because iron is essential for the synthesis of chlorophyll, and a lack of iron can lead to a blockage in chlorophyll production, resulting in yellow leaves.
2.Countermeasures: Once iron deficiency yellow leaves are found, iron-containing fertilizers such as ferrous sulfate can be appropriately applied, diluted according to the recommended concentration in the instructions, and then irrigated for use. At the same time, improving soil pH is also the key to solving the problem of iron deficiency, and rhododendrons prefer a slightly acidic soil environment (pH value of about 4.).5-6), so the soil pH can be adjusted by adding rotting pine needle soil, peat soil, etc.
Too much lightAlthough rhododendrons like a semi-shady environment, if they are exposed to direct sunlight for a long time, it is easy to cause leaf burns, and then yellow leaves or even scorched phenomena. Especially in the hot summer months, strong sunlight can accelerate the evaporation of water, leaving the plants in a state of dehydration.
2.Countermeasures: Avoid direct sunlight, especially in the hot season, choose a location with sufficient scattered light to place azaleas, or use shade nets to properly block direct light. Replenish water at the right time to ensure that the plants do not lose water due to excessive sunlight.
Lack of lightOn the other hand, if left in the shade for a long time, the leaves of the rhododendron cannot carry out effective photosynthesis, which will also cause the leaves to fade in color and gradually turn yellow.
4.Solution: Make sure the azaleas are able to receive at least 3-4 hours of soft scattered light per day, such as morning or evening sunlight. In the case of limited lighting conditions, try using grow lights to fill in the light.
The air humidity is too lowRhododendron is native to a humid environment and has certain requirements for air humidity. Under dry climate conditions, rhododendron leaves are prone to lose moisture, causing problems such as yellow leaves and curl.
2.Solution: Maintain a high relative humidity in the surrounding environment, especially in dry seasons or in air-conditioned rooms, and increase air humidity by spraying humidification, setting up a water basin, or using a humidifier. In addition, watering should follow the principle of "seeing dry and wet" to avoid over-drying or over-wetting soil.
Soil waterlogging leads to rotten roots and yellow leavesIf you water too much, it will cause water accumulation in the soil, which may lead to hypoxia and rot of the rhododendron root system, which will affect nutrient absorption and lead to yellow leaves.
4.Solution: Choose loose, breathable and well-drained soil to plant rhododendrons, observe whether the surface layer of the soil is dry before each watering, and only water appropriately when the surface soil is dry. In winter, the frequency of watering should be reduced during the low temperature period.
If you want to make the azalea flourish and the flowers are bright, we need to take into account all factors in our daily maintenance and take comprehensive measures to effectively prevent the occurrence of yellow leaves and let the azalea thrive under your careful care. Cuckoo