What if the geranium leaves turn yellow? Causes of yellowing of pelargonium leaves and its solution

In many families window sill can see a kind of flower, is geranium, especially abroad, it can decorate the street, ornament life. Geranium is becoming more and more popular in the family these days, but problems are frequent and yellow leaves always appear. What should I do?

Cause analysis and treatment of geranium leaves yellowing:

1. Environmental mutation causes yellow leaves of geranium: yellow leaves caused by changing the environment. Many flower friends will move the sky indoors from the outdoor flower stand before the summer high temperature comes, or move from the south balcony to the north balcony, or move from the outdoor to the corridor with full sunshine, or put a sunshade net on the flowers, etc. Suddenly, the growth environment will change greatly, which will cause the old leaves of geranium to yellow and the buds to dry up.

Solution: We don't have to worry too much, Xiaotian has a process of adapting to the new environment, just need to pinch off the yellow big leaves, dried flower buds can, other normal management.

2. Too much watering leads to yellow leaves of geranium (yellow water): due to excessive watering, excessive watering, long-term overwetting of the pot soil, and high temperature, part of the root system of Tianzhu is rotted, which is manifested in that there is no obvious change in the old leaves and the young leaves turn pale yellow. Severe old leaves will also appear yellow leaf shedding phenomenon.

Solution: This requires immediate water control, loose basin soil placed in a ventilated dry place to speed up evaporation of water. Or place the pot on a wad of newspaper or dried peat, allowing the newspaper and peat to suck out excess water as quickly as possible. In particularly serious cases, the whole soil block can be removed from the basin and placed in dry peat or mound, so that water can seep out quickly, and then re-planted into the basin after the drooping branches and leaves recover.

3, long-term water shortage causes geranium leaves yellow (drought yellow): some flower friends may misunderstand the problem of proper water control of geranium in summer, so let the pot soil completely dry for a long time before watering, causing geranium leaves to turn yellow from bottom to top, and when severe, petioles droop wilting.

Solution: In this case, you need to adjust the watering method, using the principle of alternating wet and dry to water the small days.

4, exposure causes geranium leaves yellow (burning yellow): here to write yellow symptoms.

Geranium is a warm and humid environment. Exposure to the sun can cause the leaves to turn yellow and die severely.

Solution: It is best to put it in a cool place in summer.

5, dry air causes geranium leaves yellow: dry air, no ventilation will lead to yellow branches and leaves.

Solution: transplant ventilation place.

6. Insufficient sunlight causes yellow leaves of geranium (lack of light yellow): the leaves on the inner side of the plant are yellowed due to insufficient light, the old leaves are yellowed after germination of new branches and leaves, edema disease and yellowing of leaves caused by large falling water, and the environment of potted flowers changes greatly (such as sudden movement from outdoor to indoor in midsummer or just entering the room in winter).

Solution: Because yellow leaves also want to recover as soon as possible, they absorb the nutrients accumulated by the plant itself, and it consumes more nutrients than it produces. So we don't have to worry too much, just remove the yellow leaves in time.

7, the temperature is too high to lead to yellow geranium leaves: this is due to the summer temperature is too high, affecting the normal absorption of iron elements from the soil roots, resulting in new long leaves appear high temperature, iron deficiency yellow leaves, white leaves. When iron deficiency is slight, the tender leaf mesophyll tissue is light green, and the veins remain green; when iron deficiency is severe, the tender leaves are all yellow-white, and there are withered spots and gradually scorched and fallen off.

Solution: This situation does not have to worry too much, you can spray and irrigate chelated iron solution. Once a week, after 3 times can basically return to normal. In addition, reduce the ambient temperature, such as moving to a cool and ventilated place or air-conditioned room, the leaves will slowly return to normal.

8, the temperature is too low to cause geranium leaves yellow: geranium sex likes warm winter and cool summer, winter indoor temperature every day to maintain 10-15℃, night temperature above 8℃, that is, normal flowering. But the optimum temperature is 15-20℃. If the temperature is too low, it will cause the leaves to yellow.

Solution: It is best to keep it indoors in winter and maintain the optimum temperature.

9. Excessive fertilization of geranium leads to yellowing of leaves (fat yellow): excessive fertilization or excessive concentration will cause burning roots and rotten roots. The reaction on the leaves is yellowing of old leaves, hypertrophy of young leaves, luster and unevenness.

Solution: At this time, it is necessary to control fertilizer, cultivation and watering. If the fertilizer is serious, it should be poured immediately, part of the old soil should be removed, and the soil should be washed with water, replaced with plain soil without fertilizer, and re-rooted.

10, geranium long-term lack of fertilizer leads to yellow leaves (lack of fertilizer yellow): geranium flowers diligently, and flowering will consume a lot of nutrients. Spring is the full bloom of small days, they spare no effort to bloom, bring a lot of joy and joy to flower friends, if we do not timely carry out appropriate topdressing, yellow leaves will appear after flowering phenomenon.

Solution: In this case, it is necessary to gradually increase the concentration of fertilizer after thinning, to prevent excessive fertilization from burning seedlings until the color of leaves returns to normal, and then apply fertilizer according to conventional methods.

11, rotten roots cause geranium leaves yellow: too much watering causes geranium roots to rot.

Solution: Remove the rotten roots, sprinkle them with multi-yin spirit, plant them with new soil, irrigate them with multi-yin spirit soaked water 3 hours after planting, and spray the leaves with multi-yin spirit.

12. Diseases and insect pests lead to yellowing of geranium leaves: if geranium is infected by fungi, viruses and other pathogens, it will cause a variety of leaf spot diseases, gray mold, local tissue necrosis of leaves, chlorosis or yellow green mosaic mottled, or the whole leaf turns yellow and falls off. By red spiders, white planthoppers and other pests damage, chlorophyll is destroyed, leaves also appear yellow and white spots, or leaf color yellow off.

Solution: This requires timely spraying according to the cause of pests and diseases.

Geranium farming methods:

1, soil: Pelargonium adaptability is also strong, all kinds of soil can grow, but rich in humus sandy loam growth best.

2, watering: geranium likes dry and wet, winter watering should not be too much, to see dry and wet. Wet soil is tender stem quality, adverse flower bud and open. Long-term too wet will cause excessive growth of plants, flowering parts upward, leaves yellow and fall off.

Sunshine: Geranium needs plenty of sunshine during its growth period, so it must be placed in the sun in winter. Light is insufficient, stem and leaf is excessive long, peduncle is thin and soft, inflorescence grows badly. Flowers in weak light often bloom poorly and wither ahead of time.

4. Temperature: Geranium likes warm winter and cool summer. In winter, it keeps I0-15℃ indoors every day. At night, the temperature is above 8℃, which can bloom normally. But the optimum temperature is 15 - 20℃.

5, fertilization: geranium does not like big fertilizer, too much fertilizer will make geranium growth too prosperous adverse flowering. For flowering luxuriant, every 1-2 weeks watering thin fertilizer water (decomposed bean cake water) every 7 - 10 days watering 800 times potassium dihydrogen phosphate solution can promote normal flowering.

6, pests: geranium ventilation is poor and too wet, prone to leaf spot disease and flower blight. After discovery, attention should be paid to ventilation, immediately remove sick flowers and leaves to prevent infection, and spray equal amounts of Bordeaux mixture for prevention and control. Pests mainly red spiders and whiteflies damage leaves and flowers, available 40% omethoate emulsion 1000 times spray kill.

7. Pruning: pruning and topping are to promote the flowering of geranium with more branches, and the plants should be pruned many times to promote the increase of branches and pregnant buds. After the flower withers, it is necessary to cut off the residual flowers in due time, cut off the dense and thin branches, so as not to consume too much nutrients, but it is cold in winter and should not be cut again.

Geranium winter maintenance

Temperature control and light preservation Pelargonium is warm and afraid of cold. In winter, cold protection measures should be taken. The indoor temperature should be kept at 15℃-20℃, and the night temperature should not be lower than 10℃. In the environment of too low temperature, the plant grows weakly, which is not conducive to flower bud differentiation, resulting in less flowering or even no flowering. However, the temperature higher than 25℃ is also unfavorable for its growth and development. At ordinary times, the pot plant should be placed in the sunny window to fully receive the light. If the light is insufficient, the plant is easy to grow wildly, affecting the formation of flower buds, and even causing the formed flower buds to wither.

Moderate water and fertilizer geranium afraid of wet drought resistance, daily watering to appropriate, generally 5 days-7 days watering once, keep the pot soil slightly dry can see wet. Too much watering can cause yellow leaves to fall off, affect flowering, and even cause rotten roots and death. At ordinary times, it is necessary to spray the leaves with clean water to keep the leaves clean, which is conducive to photosynthesis. In order to make geranium bloom continuously after winter, sufficient nutrients need to be supplied. Thin liquid fertilizer should be applied every 10 days or so. Bean cake, hoof and fishy water can be mixed and used after fermentation.

Pruning and topping is to promote the flowering of geranium with more branches, so it is necessary to carry out multiple topping of plants to promote the increase of branches and pregnant buds. After the flower withers, it is necessary to cut off the residual flowers in due time, cut off the dense and thin branches, so as not to consume too much nutrients, but it is cold in winter and should not be cut again.

Main diseases of geranium:

1. Leaf spot disease. Early leaves will appear needle-sized, round or irregular brown spots, gradually expanding into dark brown or auburn spots, serious when the whole leaf is covered with disease spots, until dry off. Its stems and branches are also black, shriveled and rotten, and even the leaves on the stems are withered and necrotic, leaving only a few leaves at the top.

Preventive measures:

A. Greenhouse cultivation density should not be too large, pay attention to regular ventilation and light transmission.

b. Avoid watering plants and avoid splashing water droplets.

c. Avoid cutting cuttings on diseased plants. If diseased leaves and branches are found, they should be cut off and burned in time.

d. spray 200 times equivalent Bordeaux mixture once every 2 weeks for 3 consecutive times during the period of high temperature and humidity.

2. Grey mold. The disease is mainly caused by excessive watering, and is more serious if it is cold and wet. First harm flowers, so that the edge of the petals dark withered, air humidity will appear gray mold layer, floret kink together, the victim petals fall on the leaves, but also cause the disease of the leaves. Brown spots like water stains appear on the leaves, and after drying, they are covered with light gray layers.

Control measures: a. Remove diseased leaves and flowers in time, avoid feeling the plants when watering, remove the water on the leaves and flowers in time, and pay attention to ventilation and light transmission.

b. At the early stage of the disease, spray 75% chlorothalonil 500 times solution for 3 consecutive times.