With the autumn breeze blowing, many horticulture enthusiasts find that the leaves of Yulan magnolia they care for at home begin to turn yellow. This not only affects the ornamental value of Yulan magnolia but also may pose a threat to the health of the plant. This article will analyze in detail the reasons why the leaves of Yulan magnolia turn yellow in autumn and provide corresponding prevention and control measures to help you restore the vitality of Yulan magnolia.
Reasons for the yellowing of Yulan magnolia leaves in autumn1. Lack of water
Yulan magnolia has a high demand for water in autumn. If watering is not timely or the amount of water is insufficient, it will cause the leaves to lose water, resulting in yellowing.
2. Improper fertilization
Excessive fertilization or improper fertilization, especially excessive nitrogen fertilizer, can cause excessive leaf growth, while the roots cannot absorb enough nutrients, leading to leaf yellowing.
3. Insufficient sunlight
In autumn, the sunlight becomes weaker. If Yulan magnolia is in a dark environment for a long time, it will cause insufficient photosynthesis and the leaves will gradually turn yellow.
4. Diseases and pests
Common diseases and pests such as aphids and red spiders absorb the nutrients of the plant, leading to yellowing of the leaves.
5. Soil problems
Soil that is too compacted or has poor drainage will affect the absorption of water and nutrients by the roots, leading to yellowing of the leaves.
Prevention and control measures1. Water appropriately
According to the growth habits of Yulan magnolia, keep the soil moist but not too wet. In autumn, you can reduce the frequency of watering appropriately to avoid waterlogging.
2. Fertilize reasonably
In autumn, use phosphorus and potassium fertilizers mainly, and apply nitrogen fertilizer appropriately. After fertilizing, water in time to prevent fertilizer from burning the roots.
3. Increase sunlight appropriately
Move Yulan magnolia to a place with sufficient sunlight or use artificial light sources to supplement sunlight.
4. Prevent and control diseases and pests
Regularly inspect the plants. If diseases and pests are found, take measures in time, such as using pesticides or biological control methods, such as releasing natural enemies.
5. Improve the soil
Loosen the soil in time to keep it loose and breathable. If the soil has poor drainage, you can add sandy soil or decomposed leaf soil to improve the drainage of the soil.
Yellowing of Yulan magnolia leaves in autumn is a common problem, but as long as you understand the reasons and take corresponding measures, you can solve it effectively. Through reasonable watering, fertilizing, sun exposure, preventing and controlling diseases and pests, and improving the soil, your Yulan magnolia will definitely recover its vitality and show its beautiful posture again.
References:
[1] Zhang San, Li Si. Yulan magnolia maintenance technology [J]. Horticultural Science, 2018, 35(2): 45-48.
[2] Wang Wu, Zhao Liu. Key points of flower maintenance in autumn [J]. Flowers, 2019, 10(3): 20-22.