What to Do When Osmanthus Leaves Turn Yellow
As one of the top ten famous traditional Chinese flowers, the issue of yellowing leaves in osmanthus plants困扰s many gardening enthusiasts. Leaves act as a barometer of plant health, and yellowing often indicates root damage, metabolic imbalance, or unsuitable environmental conditions. This article will systematically analyze four key causes and provide highly operable solutions.
Temperature Control Solutions
Summer High-Temperature Protection
When the temperature consistently exceeds 32℃, it is recommended to use a shading net cover, combined with early morning and evening foliar spraying to cool down. A north-facing balcony or dappled light environment under tree shade can prevent sunburn.
Winter Low-Temperature Management
When the temperature drops below -5℃, it is necessary to build a double-layer thermal insulation shed. Covering the potting soil surface with 5cm of pine needles can increase the ground temperature by 3-5℃. Indoor maintenance requires ensuring 4 hours of direct sunlight daily.
Scientific Water Management
Irrigation Quantification Standards
Use the bamboo stake test: insert a 30cm bamboo stake into the potting soil, and water when only the tip of 2cm is moist after pulling it out. Maintain a watering cycle of 7-10 days in spring and autumn, and shorten it to 5-7 days in summer.
Soil Improvement Solutions
Configure the soil in a ratio of 4:3:3 with decomposed leaf soil, coarse river sand, and perlite to ensure porosity of over 40%. Add 20% fermented pine bark to improve the structure during pot replacement every spring.
Nutrition Supplement Strategies
Fertilizer Ratio Solutions
In the growing season (March to June), apply slow-release fertilizer with N-P-K=18-6-12, with the dosage controlled to 150g per square meter. Combine this with a monthly foliar spray of chelated iron fertilizer.
Acid-Base Adjustment Techniques
Regularly test the soil pH value. When the value is greater than 7.2, use a 0.2% ferrous sulfate solution for root irrigation. Beer should be diluted 50 times before application, and not exceed 200ml per month.
After three months of continuous care and observation, 85% of the plant cases can recover their lush green leaves. It is recommended to establish a maintenance log to record data such as temperature and humidity, and fertilization cycles. For persistent yellow leaves, test the soil EC value to rule out the possibility of salt damage. Remember, plant restoration requires time and patience.