The hibiscus leaves will freeze to death if they drop below 5 degrees.
In the north of April, the temperature is still relatively low and the wind is relatively strong. Your hibiscus is not suitable for this environment.
In addition, Fusang avoids waterlogging, and it is easy to turn yellow if the leaves are watered too much.
Cultivation and maintenance of hibiscus flowers;
Cultivation management of hibiscus.
Pots of 15 ~ 20 cm are generally used for potted hibiscus. When the seedlings grow to 20 cm high, they should be pitted to promote their branching, and then the height of hibiscus can be controlled by pitting to achieve potted plants. The seedlings are symmetrical and beautiful. Fusang is particularly tolerant of chemical fertilizers. Fertilize 1 time every half month during the growth period or use "Huiyou" 15- 15-30 special fertilizer for potted flowers. Stop fertilizing in winter. Changing pots every spring requires pruning and shaping. Young plants can be lightly cut, and old plants should be re-cut, so as to keep the crown beautiful and promote more branches and flowers.
Hibiscus diseases and insect pests control
Leaf spot, anthracnose and sooty blotch often occur, and 70% thiophanate-methyl wettable powder 1000 times can be sprayed. Pests include aphids, red spiders, thorn moths, etc., and sprayed with 10% pesticide emulsifiable concentrate 2000 times.
Aphids, scale insects and bituminous coal diseases. Insect pests can be killed manually or sprayed with dimethoate 1000 times; The prevention and control method of bituminous coal disease is mainly to improve environmental conditions, mainly through adequate illumination and good ventilation.
Aphids on young leaves, scale insects on branches. Spraying 40% dimethoate 1000 times can kill two pests. When a small amount of scale insects are found, they can be brushed off with a hard brush.
Post-treatment of hibiscus flowers
In the south, hibiscus is mostly planted in Chi Pan, in front of pavilions, on roadsides and by walls. Throughout the year, the big red flowers are in full bloom and are very lively. Potted plants are often used to decorate balconies or small gardens in the Yangtze River basin and the north, and the viewing period is particularly long when the light is sufficient. It is also one of the main flowering potted plants placed in public places in summer and autumn. During the storage and transportation of hibiscus, if the light is insufficient, the soil is too dry and ethylene exists, the buds and flowers will fall off. Potted hibiscus flowers must be sprayed with 0.5 ~ 0.8 mmol silver thiosulfate solution 2 weeks before storage and transportation, and the storage and transportation temperature is 20 ~ 265438 0℃, and the relative humidity is 80%, which can withstand the dark environment for no more than 3 days.