Is the multi-headed chrysanthemum hardy?
As autumn and winter approach, the most concerned issue for Compositae plant lovers is the cold-resistant characteristics and overwintering skills of multihead. The cold resistance of this perennial flower, which is both ornamental and adaptable, is often misjudged. This paper will systematically analyze the cold-resistant mechanism of multihead and explain in detail the key points of overwintering maintenance by region. In-depth analysis of the cold-resistance characteristics of Polycephalus multicephalus plants physiological cold-resistance thresholds The underground roots of Polycephalus can tolerate low temperatures of-15℃, but the aboveground parts will experience frostbite symptoms below-5℃. Experimental data shows that an environment below-8℃ for 48 hours will prevent 60% of plants from returning to green. It is recommended that the northern region stabilize the environmental temperature above-5℃, and the southern region try to wintering in the open. Temperature adaptability is expressed in the growth range of 15-25℃, and plants can grow by 2- 3 cm per day. When the temperature dropped below 5℃, the growth rate dropped to 0.5 cm per week. It is worth noting that when the temperature difference between day and night is greater than 10℃, the flower bud differentiation efficiency is increased by 40%. Temperature management plan for the three-dimensional maintenance system of multihead wintering in southern China: The "stepped pruning method" is used to reduce the plant height to 15-20cm in three times, and bamboo and wood brackets are used to prevent snow from crushing branches. Northern region: Indoor maintenance requires direct light for 4 hours a day. Pay attention to leaving vent holes when using PE insulation film to avoid mildew caused by excessive humidity. The moisture control technique uses the "knuckle detection method": insert the index finger into the second knuckle of the basin soil. If the fingertip is moist, there is no need to water it. It is recommended to use a long-spout pot to slowly inject water along the wall of the basin to avoid thorough watering and keep the soil water content within the range of 30%-40%. Nutrient supplementation strategy For winter flower varieties (such as Hanju series), a slow-release fertilizer with a phosphorus and potassium ratio of 3:1 is applied every month, combined with foliar spraying of 0.1% potassium dihydrogen phosphate solution. For dormant varieties, base fertilizer application needs to be completed before winter. It is recommended that decomposed sheep manure and bone meal be mixed and buried in a ratio of 2:1. When special climate response measures encounter extreme cold currents, temporary double-layered scaffolds can be built: inner nonwoven fabric (density 50g/㎡)+ outer transparent PVC, with an interval of 15cm to form an air insulation layer. Check the joints of roots and roots in time after melting snow, and use 800 times carbendazim solution to prevent rot.
By scientifically grasping the cold-resistant characteristics and zoning maintenance points of multihead, and cooperating with precise temperature and humidity control, the plants can be ensured to survive the winter safely even in severe cold areas. When spring warms up next year, remember to gradually remove protective measures so that the plants can naturally adapt to environmental changes and prepare for a new round of growth cycle.