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Hibiscus rosa sinensis: general characteristics.
Hibiscus rosa sinensis is a shrub belonging to the Malvaceae family and is native to China. It belongs to the typology of perennial and semi-rustic plants. It is a pretty versatile flower as it can be planted both in the garden and inside the house. In the countries of origin (China), its size can reach about 10 meters maximum and, if cultivated in pots, reaches a maximum height of 3 meters. The leaves are a glossy green, with a serrated edge and a sharp point; the inflorescences are funnel-shaped, consisting of 5 bright red petals and formed between June and September. The inner part of these flowers is composed of a long stem column that has small stamens on the upper part and has 5 pistils on the tip.
Hibiscus rosa sinensis: cultivation.
Being a very versatile plant, the Hibiscus rosa sinensis it is suitable for both outdoor and pot cultivation. Its ideal condition is to be planted in a well-drained soil, light, aerated and composed partly of sand. He loves sunlight but not direct light; during the summer season it is convenient to put the vase in the garden and in a place sheltered from the sun. During the winter season it is convenient to place it in an environment where temperatures are between 10 ° C and 13 ° C. if this does not happen, leaves may be lost and if it is attacked by frost it reaches death. As for watering, they must be regular during the summer season and, only after the soil is dry; it is possible to vaporize the water on the leaves. Fertilization is essential to maintain the inflorescences and enhance their typical color.
Multiplication and pruning
The multiplication of the Hibiscus rosa sinensis it happens through normal sowing and cutting. If you decide to multiply the hibiscus by sowing, you need to implement this practice in July and use some soil composed of sand and peat. The cutting and, therefore, the cutting of a branch from the mother plant to create a daughter plant, is carried out in the following way: a young branch is cut with a length of about 8/10 centimeters and is planted in an environment with a temperature between i 18 ° C and 21 ° C; moreover, the cutting is not covered to avoid the appearance of possible rottenness that would cause the death of the same cutting. Regarding pruning, it is practiced when the plant reaches the fourth year of age. Once this threshold is reached, one proceeds with pruning of an educational nature, before the new branches are formed so as not to have too many and harmful inflorescences.
Diseases and pests
The diseases and the main parasites that attack and seriously damage Hibiscus rosa sinensis are: the cottony cochineal, the aphids, the brown cochineal and the white mal. Brown scale insects form brown growths and brown spots and a sugary-based sticky substance form in the plant. They are removed manually through a cotton pad soaked in water and alcohol. The cottony cochineals attack in the presence of a hot and dry climate; they are removed in the same way as the brown cochineals, treated with an anticoccidico and vaporize the water on the foliage in such a way as to increase the level of humidity. Aphids attack young branches, flowers and buds. They bring the plant to produce sugary substances and make it vulnerable to attacks by fumaggini. They are eradicated with normal septicides. The white mal is also called Oidium, it is caused by fungi belonging to the Eirisifaceae family; causes white spots on leaves and stems and is treated with fungicides.