Over 250 species of plants are known in the genus of hibiscus of the family malvaceous, which are represented in the subtropics and tropics of both hemispheres. For a long time, the plant has been grown in botanical gardens, greenhouses. Hibiscus is very popular in home gardening. The most common distribution is the Chinese rose or Chinese hibiscus, born in the tropics of Southeast Asia and Polynesia.
There are many varieties of Chinese hibiscus that vary in size, color of flowers and their degree of terry. A rose is a very beautiful flower, and like all living things, it is not immune from diseases and pests. It is important to properly care for the plant in order to provide comfortable living conditions.
The Chinese rose is undemanding, will suffer the shortcomings when caring for it, if inattention to the plant does not develop into a permanent phenomenon. More often, for objective reasons, roses turn yellow and fall leaves. It is important to understand what is happening and take action to eliminate weaknesses in care, so as not to let the flower die.
Consider the most common causes of yellowness and leaf fall.
At a Chinese rose, in preparation for the dormant period, leaves turn yellow and fall off. A flower discards part of the leaves in winter; it needs rest after flowering and to restore strength for the future. The rose gets rid of the yellowed old when a lot of young leaves appear on the bush.
Old plants that are preparing to die, also throw off the leaves. These are natural causes of leaf wilting.
Hibiscus does not like being moved from place to place. A simple turn or transfer to another room causes severe stress to the plant. The flower before adaptation under new conditions discards the yellowed leaves. A difficult test for a rose is a transplant into a new pot. She is sick for a long time, because during transhipment, roots are often damaged. While new roots regenerate and grow, the flower discards foliage.
Dried soil in a pot with a Chinese rose leads to the death of the roots and a massive flight of foliage. The reason is a cramped pot or insufficient moisture. The required amount of nutrition is not delivered to the leaves, they turn yellow and fall off. Find out the exact cause of the dried earth in the center of the flower pot. To do this, a rose is watered in the morning, and closer to night they look to see if the earth has dried in the center of the container. Dryness indicates that the flower is crowded in this container. In summer, the Chinese rose feels a lack of moisture, even with constant watering in the morning and evening.
Excess moisture can adversely affect the flower. Hibiscus will fade. The earth in the pot is compacted, air does not enter there. Stagnant water appears, the soil becomes swampy, which leads to the emergence of bacteria and fungi. This is due to the large pot. The roots of the plant in this environment rot and die. Sick roots do not supply enough nutrition for the normal existence of hibiscus. Leaves turn yellow and fall.
As a native of the tropics, the Chinese rose does not tolerate cold and drafts, it is kept away from air conditioners. When ventilating, the rose is closed from the air stream. Indoor flower contain in an acceptable temperature environment + 18.30 ° C. In winter, when the rose is in a state of hibernation, the temperature in the room is + 13.15 ° C, provided that there is additional lighting. In the spring and before the start of autumn, the room is maintained at + 17.23 ° C. Cooling to + 10 ° C provokes yellowing and falling of leaves.
Another reason that the leaves of the Chinese rose turn yellow and fall off is improper lighting. As usual, they turn yellow on the side of the plant, which is in the shade. However, hibiscus should not be exposed to direct sunlight. Excessive sun exposure will cause burns, which will cause yellowing on the leaves, and they will fall off.
Hibiscus is still responding to a lack of lighting. Favorable effect on the flower diffused lighting. And in winter, the lack of natural light is supplemented by the light of fluorescent lamps.
Evidence of Chinese hibiscus disease with chlorosis is yellowing of a leaf plate, while the veins remain green. In addition, spots appear on the leaves. The cause of these phenomena is called the increased acidity of the soil, which is provoked by tap water. Chlorosis affects not all plants at once. Young roots and tops of roses are more often sick, and yellow leaves fall off.
Lack of minerals
It is important to note in which part of the Chinese hibiscus leaves turn yellow. A lack of nutrients is said if the upper leaves of the flower turn yellow. Leaves turn yellow with insufficient zinc, manganese, magnesium and iron. The increased content of chlorine and calcium in water causes shedding of the lower leaves, and new ones grow yellow. If there is not enough nitrogen or iron, the phenomenon repeats.
Fertilizers must be applied carefully, most importantly, do not go over the norm. If there is not enough nitrogen, the veins of the leaf turn yellow; if potassium, the entire plate turns yellow. The high content of magnesium and potassium does not harm the development of hibiscus.
The content of nitrogen and phosphorus, exceeding the norm, leads to massive yellowing of the leaves.
The pest is activated on the plant when the air is dry in the room. In addition to yellowing leaves, a cobweb and whitish bloom forms on the flower. Traces of stay of ticks are traced on the back of leaflets in the form of small dots. In order not to provoke the activation of ticks, the air next to the plant is moistened, and vessels with water are placed next to it.
What to do?
So that the hibiscus leaves do not turn yellow and fall, and the rose lives comfortably at home, it must be properly looked after all year round, monitor the health of the flower and protect it from pests.
Flower pot replacement
A small pot does not allow the rose to grow and develop properly, so it is changed to a large one, which is 2-3 cm in diameter wider than the previous one. Transplanted flower transshipment method, so as not to harm the roots. Hibiscus is placed in a new pot with moistened soil and drainage, watered only on the third day.
The formation of excess water in the pan indicates that the pot for the plant is too large. It is replaced with a smaller one, so that there is no decay of the roots and death of the plant. Before transplanting the flower, examine its root system, clean it from the ground, remove rotten fragments, treat the roots with a fungicide solution and sprinkle the sections with Kornevin powder or crushed activated carbon. After transplantation, the flower is sprayed with Zircon or Epin.
For the lush flowering of the Chinese rose, the development of beautiful and healthy foliage in the summer, the flower is abundantly watered. The main thing is not to overdo it, the plant is watered again after drying of the upper layer by 2-3 cm. The earth should not be dry or wet, but constantly wet. In hot windy weather, it is recommended to water the flower every day, or even 2 times a day, as well as spray it with water.
In winter, the Chinese rose is at rest, but this does not mean that it does not need to be watered , you just need to increase the time between waterings. Heating dries the air in the room in the cold season, so it is important to spray the flower and air next to it, and put a vessel with water next to it. Too much air can cause illness.
The disease chlorosis occurs in a plant due to irrigation of untreated and unstable water. It is better to transplant the Chinese rose to a new land or to feed with complex fertilizers, in which magnesium is present but not containing lime. Sometimes they use Epsom salts or magnesium in chelated form. Iron chelate is added to the water that is watered with a flower, with a lack of iron.
You need to feed a Chinese rose in the morning or after sunset on cloudy, non-hot days. From the beginning of spring to September, the flower is fed 1 time per week, or more often, but at lower doses. In winter, top dressing is applied only to flowering plants and only 1 time per month. Some gardeners use water with added sugar as a top dressing - half a teaspoon of sugar in a glass of water.
Hibiscus is fed with nitrogen fertilizers with caution - over-saturation leads to a burn. Brown spots appear on the leaves, which indicates a supersaturation of the plant with nitrogen. Gradually the leaves die off and the flower dies. To save the roses, they give her a break from dressing. Two weeks watered with clean water without impurities. When the plant recovers, it is fed and nitrogen is added in small doses, the concentration is gradually adjusted to an acceptable value.
Fight against spider mites
They begin to fight pests hastily, otherwise it will not work to save the flower. If the parasite did not have time to severely damage the leaves, then the foliage and stems are thoroughly washed with soapy water. If the lesion is serious, then the rose must be treated with insecticides. Leaves are sprayed on both sides. Suitable drugs for this are Fitoverm, Aktofit, Fufan, Antiklesh, Actellik. Spraying is done every 4-5 days 4 times in a row.
In addition, next to the flower are placed vessels with water or humidifiers. Spray plants and the air around them with water 1-2 times a day. It is important to create moist air around the flowers. Ticks are afraid of moisture. In humid air they will perish. Leaflets will remain green and beautiful.
To combat the tick, flower growers also use folk remedies. To do this, 1 part of dry red pepper is poured with 2 parts of water, boiled for 1 hour, filtered. Hibiscus is treated with soapy water, to which 10 g of the resulting pepper solution are added.
Chinese rose will freely grow new foliage after treatment and release from pests. To do this, remove all dried branches and leaves. Every spring, a young plant needs a transplant, it is transplanted, and each time the flower is transplanted into a more spacious pot, leaving room for root growth.
Hibiscus is transplanted into light and nutritious soil. It is desirable that it consisted of a sheet - 1 part, turf - 2 parts and humus land - 1 part. In addition, coarse sand is added to the soil, bone meal can be added. Drainage is laid at the bottom of the pot, which may consist of broken brick, ceramic shards, gravel, gravel or expanded clay. The main condition - drainage should not injure the roots.
To form a beautifully shaped bush, you will need to trim too long shoots. Old, dried, damaged or weak shoots are removed. Sometimes they pinch the tops of the shoots of a young plant to form a crown. Sliced areas are dusted with charcoal. After trimming, the room temperature is lowered by 2 ° C. You can not dry the soil, so every day the plant needs to be sprayed with water at room temperature.
An adult flower, which is more than 3-4 years old, is transplanted every 3-4 years. Each spring, a small layer of new soil is added to the pot on the old earth in a pot.
So that the leaves of a Chinese rose always remain green and healthy, observe the following conditions:
- watering is not too often, but regularly, do not allow the drying of the soil;
- Do not leave in direct sunlight, but clean in partial shade;
- fed once a week until September, and then - once a month;
- watered less often in autumn and winter, kept indoors at a temperature not lower than + 15 ° C;
- sprayed with water every day all year round;
- in time transplanted into suitable land with drainage;
- so that indoor plants do not receive sunburns, they take them out in the sun for a short time, gradually increase their stay;
- regularly inspected to identify pests;
- regularly cleaned of dust with a warm shower, covering the ground.
About why a Chinese rose drops its buds, see the next video.