What should I do if the leaves of peony flowers turn yellow?
Peony Flower, known as the "Prime Minister among Flowers", is often charming with its elegant and luxurious attitude. However, when yellowing of peony leaves is found, flower friends are often at a loss. This paper will systematically analyze the four main causes of yellow leaves of peony and the corresponding scientific treatment plans from soil management to daily maintenance. 1. Imbalance of the soil environment 1.1 Soil hardens and droughts. The roots of peony are fleshy roots and require loose and breathable cultivation substrates. When the soil hardening coefficient exceeds 30%, root respiration is blocked and the water absorption rate drops by 67%. The soil structure can be improved by adding legular soil (ratio 3:1), and the topsoil can be moved weekly with a loosening rake. 1.2 The root system of peony treated with standing water is drought-tolerant but not waterlogging. Standing water for three consecutive days will increase the root rot rate by 85%. It is recommended to use ceramsite cushion (5cm thick) combined with sandy loam soil cultivation, and ditch ditches and drainage in time after rain. When water accumulation has occurred, it can be transplanted to a cool and ventilated place to dry the roots for 24 hours. 2. Misunderstandings in nutrition management 2.1 Symptoms of excessive nitrogen fertilizer Excessive application of urea can cause disorder of chlorophyll synthesis, which is manifested by curling new leaves and yellowing of old leaves. It is recommended to use slow-release fertilizers with NPK=10-20-20, and the amount per square meter should be controlled within 50g. During the yellow leaf period, 0.2% ferrous sulfate solution can be sprayed on the leaves (once a week). 2.2 When trace elements are deficient, magnesium is deficient, reticular macula appears between veins, and when manganese is deficient, young leaves are yellowed. It is recommended to apply full-scale fertilizer containing trace elements every quarter and use EM bacterial solution to irrigate roots, which can increase the nutrient absorption rate by 42%. 3. Key points for pruning and maintenance 3.1 The best pruning period is before spring germination. Early pruning will block the transportation of phosphorus. Keep 3-5 main branches and 2-3 bud points on lateral branches. Cutting tools need to be disinfected with 75% alcohol, and applying healing agent to the incision can reduce the infection rate by 90%. 3.2 The yellow leaves should be removed immediately and carbendazim solution should be sprayed on the incision when found in the emergency response of yellow leaves. Keep healthy leaves for photosynthesis, and gradually resume fertilization after new buds germinate. 4. Environmental adaptation strategies Peony needs more than 6 hours of direct light every day, and the air humidity remains at 50-65%. Build a sunshade net (30% shading rate) during high temperatures in summer, and build 10cm soil for cold protection in winter. It is recommended to change soil every year for potted plants, and plant renewal every three years for ground planting.
Through scientific regulation of soil moisture, precise fertilization, reasonable pruning and environmental management, the problem of peony yellow leaves can be systematically solved. During the maintenance process, attention should be paid to observing the color changes of the leaves and adjusting management measures in a timely manner, so that the peony can reproduce the peerless beauty of "the peony bears the favor of spring, but never envied the peony."