What to Do When the Leaves of a Dwarf海棠 Turn Yellow
As the new favorite in the courtyard, the yellowing of the leaves of the dwarf海棠 is困扰ing many gardening enthusiasts. This seemingly delicate ornamental plant can actually regain its lush green vitality through scientific care. This article will analyze the causes of yellow leaves from three key dimensions and provide actionable solutions.
Water Control: Precise Management of Dry and Wet Balance
The uniqueness of the root system determines the sensitivity of the dwarf海棠 to water. Its capillary roots account for 70%, which are not tolerant to waterlogging and afraid of drought. It is recommended to use the 'Finger Joint Detection Method': Insert the index finger into the second joint of the soil, and if there is no moisture sensation on the palm, it is necessary to supplement water. Special caution is needed during the Meiyu season in Jiangnan, and it is recommended to use smart pots with a water level indicator, watering only when the substrate moisture content is below 40%.
Ensure 4-6 hours of direct sunlight daily, but be aware of seasonal differences. Full sunlight care can be provided in spring and autumn, while using the 'Three-time Period Sunshade Method' in summer: use a 50% sunshade net for protection from 10-14 o'clock, and ensure scattered light in other periods. It is recommended to install supplemental lights in winter to maintain a light intensity of 2000-3000 lux, effectively preventing low-temperature yellowing of leaves.
After flowering pruning, nutritional supplementation is needed: ① Immediately apply a balanced slow-release fertilizer (NPK=15-15-15) after pruning; ② Switch to high-phosphorus fertilizer (P≥30%) when new buds sprout; ③ Add chelated iron fertilizer every half month during the growing period; ④ Apply decomposed sheep manure organic fertilizer before stopping fertilization in winter. Special attention should be paid to the principle of applying thin and frequent fertilization, with the concentration controlled at 0.1%-0.3%.
Through the above systematic care plan, combined with regular checks of the back of the leaves (focusing on inter-vein yellowing), significant improvements can usually be seen within 2-3 weeks. It is recommended to establish a care log, recording each watering and fertilization data, gradually mastering the plant's growth patterns, and keeping your dwarf海棠 in emerald-like healthy leaf color all year round.