Reasons for Potted Camellia sasanqua Dropping Leaves and Solutions, Teaching You Correct Cultivation
Camellia sasanqua is a plant that resembles a tea tree in appearance and has flowers like plum blossoms. It has high ornamental value, and its main ornamental appeal lies in its flowers, which are commonly rose red. Nowadays many people like to grow Camellia sasanqua as potted plants at home. However, during cultivation, leaf drop may occur due to technical reasons, so how should it be solved?
Reasons for Potted Camellia sasanqua Dropping Leaves and Solutions
1. Reasons:
1. Improper light. Camellia sasanqua cannot tolerate intense direct sunlight. If it is placed in a spot with direct sunlight during its growth period, it will affect its growth and cause its leaves to drop. Strong sunlight in summer will scorch the leaves and buds, causing the leaf surface to curl, dry up, and fall off. But if Camellia sasanqua is kept in a dark environment for a long time and cannot receive sunlight for photosynthesis, its leaves will also drop.
2. Unreasonable watering. Camellia sasanqua likes shady and moist conditions, and a semi-shady environment is most suitable for its growth, but improper watering is also key to whether it can grow healthily. Too little watering will make the soil too dry, thus reducing the water available to branches and leaves, and the leaves will dry up and drop. Too much watering causes waterlogging, affects the respiration of the Camellia sasanqua root system, and also affects leaf growth.
3. Over-fertilization. This is especially true for one- or two-year-old small Camellia sasanqua seedlings, whose root systems are tender and weak and cannot be given concentrated fertilizer. Fertilizer that is too concentrated will scorch the root system of Camellia sasanqua, causing leaves to drop, and in severe cases can even cause the plant to die.
2. Solutions:
1. Appropriate shading. As the temperature continues to rise, around noon the pot can be placed on the north windowsill of a south room or on the balcony of a north room, receiving only morning and evening sun and avoiding direct sunlight around noon. In summer, it should be placed under the eaves of a corridor or under a trellis in the yard.
2. Appropriate watering. For newly transplanted or just-mailed Camellia sasanqua seedlings, after watering thoroughly the first time, do not water as long as the potting soil is not dry. Spray water on the plant and the surface of the pot 2—3 times a day, keeping the potting soil slightly moist. This ensures the leaf surface does not lack water while preventing the potting soil from becoming too wet.
3. Light fertilization. Under normal circumstances, apply a thin nitrogen fertilizer once from February to March to promote the growth of branches and leaves. Apply a thin cake fertilizer water once between April and May to help flower bud differentiation. Apply 0.2% potassium dihydrogen phosphate once from September to October to promote larger flowers and brighter colors.
How to Grow Potted Camellia sasanqua
1. Soil: Camellia sasanqua is suitable for fertile, loose, well-drained acidic sandy soil. Alkaline soil and clay soil are not suitable for planting, and calcareous soil is even more taboo. When potting in northern regions, it is advisable to choose a culture soil mainly composed of leaf mold or peat soil, plus a small amount of river sand.
2. Watering: For Camellia sasanqua, watering should keep the potting soil moist without waterlogging. In summer, water once each morning and evening; in winter, water once every few days. Except in winter, water should also be sprayed on the leaf surface once every few days to keep the leaves clean, and watering must be thorough.
3. Sunlight: Camellia sasanqua is a semi-shade plant and avoids strong light. Generally, from May to September each year, it should be cultivated in a shaded place. If exposed to direct sunlight, it is very easy to scorch the leaves and buds, causing the leaves to curl and, in severe cases, to dry up and fall off. In late autumn and winter, it needs more sunlight.
4. Temperature: Camellia sasanqua likes a warm environment, and the suitable growth temperature is 18-25°C. The temperature must not be too high. When the temperature exceeds 35°C, young leaves are prone to sunscald. At the same time, Camellia sasanqua has strong cold resistance, and in winter it can be kept indoors in a cold room above 2°C to overwinter.
How to Prune Potted Camellia sasanqua
Like Camellia japonica, Camellia sasanqua also needs timely bud thinning and removal of faded flowers to reduce nutrient consumption. Under normal circumstances, keep 1 flower bud per branch and thin out the rest, so that nutrients are concentrated and the flowers are large and brightly colored. Timely removal of faded flowers can not only keep the plant shape attractive, but also help sprout new branches and promote healthy plant growth.
Common Diseases of Potted Camellia sasanqua and Their Control
1. Anthracnose. Regularly spray Guoguang Yintai (80% zineb wettable powder) at 600—800 times dilution and Guoguang Sitaling, for pre-disease prevention and nutritional supplementation, improving ornamental value. In the early stage of the disease, spray 25% prochloraz emulsifiable concentrate at 500—600 times dilution, or 50% mancozeb wettable powder at 400—600 times dilution. Use continuously 2—3 times, with an interval of 7—10 days.
2. White star disease. Control method: chlorothalonil and zineb types are protective fungicides, suitable for prevention before onset. It is recommended to use Guoguang chlorothalonil or 80% zineb at 600—800 times dilution for spray control before onset.
When potted Camellia sasanqua drops leaves, it is generally caused by aspects such as light and wastewater. To solve it thoroughly, the cause must be found at the root. In ordinary cultivation, management also needs to be strengthened. Timely disease control and reasonable fertilizer and water can all ensure its healthy growth.