Why do cassia leaves dry and fall off?
The editor will answer the reasons why cassia leaves dry and fall off and the related knowledge of how to remediate, let's follow the editor to take a look!
Cassia, as one of the top ten traditional famous flowers in China, is deeply loved for its rich fragrance and ornamental value. However, during the maintenance process, it is common for cassia to have dry leaves and leaf drop. This article will analyze the causes from aspects such as environment, diseases and pests, and maintenance management, and provide scientific and effective remedial measures to help flower friends restore the healthy state of cassia.
### - Common Reasons for Cassia Leaf Drying and Falling Off - #### 1. Environmental Factors - Insufficient or excessive light - Cassia prefers a sunny environment. Long-term shading can lead to insufficient photosynthesis of leaves, causing yellowing and drying; while excessive exposure to the sun in summer may burn the leaves, especially the new leaves. - Sudden temperature changes or low-temperature frost damage - Cassia has general cold resistance. When the temperature in winter is below -5°C, the leaves are prone to frostbite and drying. Additionally, sudden temperature drops in spring or early frosts in autumn may also trigger leaf drop. - Low air humidity - Cassia is suitable for a humid environment. Dry air (such as indoor air in northern winter) can cause leaves to lose water, curl, and fall off.
#### 2. Improper watering - Insufficient watering or drought - Long-term lack of water can lead to insufficient water absorption by the roots, causing the old leaves to wither and dry first, and in severe cases, the whole plant's leaves to fall off. - Excessive watering or waterlogging - Long-term wet soil or poor drainage can cause root hypoxia and rot, resulting in yellowing of new leaves, drying and falling off of old leaves, and accompanied by a moldy smell.
#### 3. Soil issues - Soil compaction or infertility - Cassia prefers loose and fertile slightly acidic soil (pH 5.5-6.5). If the soil is heavy and compact or lacks organic matter, root growth is hindered and nutrient absorption is insufficient. - Salinization or fertilizer damage - Long-term use of hard water irrigation or excessive fertilization can lead to soil salt accumulation, causing leaf edge scorching and drying.
#### 4. Pest and disease invasion - Leaf blight, (T-J) disease - Fungal infections initially cause brown spots on the leaves, which later expand into large areas, leading to drying and falling off. - Red蜘蛛, scale insects - Red spiders absorb sap from the back of leaves, causing leaf discoloration and yellow spots; scale insects attach to branches and cause sooty mold and leaf drop.
#### 5. Improper maintenance management - Root damage from potting or transplantation stress - Root damage during potting that has not recovered, or improper transplantation timing (such as during high summer temperatures), can easily cause leaf drop. - Deficiency symptoms - Lack of elements such as iron and magnesium causes leaf yellowing (leaf veins still green) and gradual drying.
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### - Targeted Remedial Measures - #### 1. Adjusting Environmental Conditions - Light management - Ensure at least 6 hours of light per day in spring and autumn, provide appropriate shading in the afternoon in summer, and full-day exposure in winter. - Temperature and humidity control - Move to a warm place (above 5°C) in winter to avoid cold winds; spray water on the leaves or use a humidifier in dry seasons.
#### 2. Scientific watering and drainage - Mastering watering frequency - Follow the "moisture after dry" principle, water thoroughly when the top 2cm of soil is dry, and avoid waterlogging. Reduce watering in winter. - Improve drainage - Place ceramic stones at the bottom of the pot or use a loose matrix (decayed leaf soil: river sand: garden soil = 3:1:1), and elevate the planting hole for ground planting.
#### 3. Optimizing soil and fertilization - Adjusting soil pH - Regularly apply a solution of ferrous sulfate (1:1000) or decomposed pine needle soil to adjust the pH value. - Reasonable fertilization - Apply diluted compound fertilizer once a month during the growing season, avoid concentrated fertilizers that burn roots; stop fertilizing in winter.
#### 4. Pest and disease control - Fungal diseases - Timely cut off diseased leaves and spray with mancozeb or carbendazim (diluted according to instructions), once a week, for 2-3 consecutive weeks. - Pest management - Use dinotefuran spray for red spiders and alcohol swabs followed by thiamethoxam spray for scale insects.
#### 5. Other maintenance techniques - Pruning and promoting new growth - Cut off withered and weak branches to reduce nutrient consumption; lightly prune to promote branching before new buds sprout in spring. - Potting precautions - Choose spring for potting, retain 1/3 of the original soil, cut off decayed roots, and avoid strong light during the slow seedling period.
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### - Long-term Strategies for Preventing Dry and Falling Leaves - 1. Regular observation: Check the front and back of the leaves, soil moisture, and plant growth every week. 2. Environmental stability: Avoid frequent moving of pots, especially during the flowering period and winter. 3. Seasonal adaptation: Prevent waterlogging in summer and protect against wind and cold in winter. 4. Cleaning leaf surfaces: Wipe the leaves with a damp cloth monthly to enhance photosynthetic efficiency.
Through the above analysis, it can be seen that the drying and falling off of cassia leaves are the result of the combined action of multiple factors, and it is necessary to judge the main cause according to the specific manifestations and deal with it accordingly. Maintaining scientific maintenance habits can make the cassia重现 lush leaves and fragrant flowers.
The above [] introduces the reasons and how to remediate for cassia leaf drying and falling off. I hope it can help you, and at the same time, I hope everyone will come to see more green plant and flower experience and common sense!