What causes camellia leaf drop?
Camellia is the general term for many plants and horticultural cultivars in the genus Camellia of the family Theaceae. It ranks eighth among the "Ten Famous Flowers" and is also one of the world's precious flowering trees and shrubs. Because of its graceful plant form, its thick, green and glossy leaves, and its gorgeous, colorful flowers, it is treasured by the horticultural world. However, leaf drop often occurs during cultivation. Let us take a look below at what is going on when a camellia drops its leaves.
Overwatering causes leaf drop
When growing camellias, some flower lovers water heavily in hopes of fast growth and early blooming, not realizing that this is a wrong approach. Although camellias need a supply of water to grow well, too much water causes water to accumulate in the pot. This accumulation makes the camellia roots unable to breathe properly, makes the soil excessively wet, and causes root rot, leading to leaf drop. So when watering a camellia, you must pay attention to the amount; watering in the right amount is what will have a positive effect on its growth.
Pests and diseases cause leaf drop
Many pests and diseases have a negative effect on plant growth. For example, anthracnose can make a camellia drop its leaves. Anthracnose is a relatively common disease that mainly occurs on the leaf parts of the camellia, producing lesions on the leaves. As the condition worsens, the lesions gradually expand, and in severe cases they cause leaf drop and affect the whole plant, causing the plant to die. Therefore, when growing camellias, you must take good pest and disease prevention and control measures, strengthen management in normal times to improve the plant's disease resistance, spray pesticides promptly in the early stages of pest or disease occurrence for treatment, and in winter be sure to clean up dead branches and diseased leaves of the camellia to reduce sources of infection.
Poor ventilation causes leaf drop
Sometimes poor ventilation can also cause camellia leaf drop, especially in winter. Keeping the camellia indoors for a long time with poor ventilation or poor air quality will cause the camellia to drop buds and leaves. So when growing camellias, especially indoors, you must pay attention to ventilation and keep the air fresh.
Sudden environmental changes cause leaf drop
When growing a camellia, suddenly changing the environment will cause the camellia to fail to adapt to the sudden change. Because the camellia has already adapted to indoor conditions such as light, suddenly moving it outdoors changes the light and temperature, and some old leaves will drop. When this happens, you should quickly move the camellia to a semi-shaded place outdoors, spray water more often, and stop fertilizing; it can slowly recover. If you want to change the growing environment of a camellia, it is best to do so step by step so that it gradually adapts.
Extra: How to grow camellias
1. Soil: Camellias have high soil requirements. Generally the soil is relatively rich in humus, with a pH between 5 and 6.5, slightly acidic. The best soil mix is 50% mountain soil, 40% wood shavings or spent mushroom substrate, and 10% cake fertilizer powder or livestock manure plus phosphate fertilizer powder.
2. Light: Camellias dislike strong light, so you must pay attention to sunlight when planting. In spring and autumn, full light is required, but in summer you must avoid direct sunlight; if exposed to strong light for too long, it can easily die.
3. Temperature: Camellias are neither cold-tolerant nor heat-tolerant. Their most suitable temperature is 18 to 25 degrees, so the ambient temperature must not be too high or too low, otherwise growth will be affected. In winter the indoor temperature must be above 3 degrees; if it is below 0 degrees, the plant will suffer cold damage.
4. Watering: Camellias like a moist environment. They cannot be too dry, too wet, or alternately dry and wet. In spring you can water more; in summer water twice a day, morning and evening; in autumn do the same as in spring; in winter it is best to water before and after the plant.
5. Fertilizing: Camellias are relatively fond of fertilizer, but fertilizing also has a limit and must not be excessive. Generally, fertilize about 3 times in the nearly half year after flowering, and once in winter. To make the flowers more beautiful, it is best to include more phosphate fertilizer in the fertilizer.
6. Pruning: Pruning camellias is very important. Generally, branches that affect the tree shape and diseased or weak branches are cut off, and the flower buds are also sorted out. Once the flower buds are too dense, they must also be thinned. After the flowers fade, they should also be removed promptly, which can reduce nutrient consumption.
7. Repotting: Camellias generally need to be repotted once every two years; changing to a larger pot is beneficial for their growth. The best time to repot is in April. Do not remove all the old soil, and add a small amount of base fertilizer, then water.
8. Pests and diseases: Camellias get sick easily. The common ones are mainly sooty mold and anthracnose. In this case, it is only necessary to spray 0.5-degree Bordeaux mixture. The main pest is the tea shoot borer; in this case, simply cut off the infested shoots.