Pelargonium is a very common and popular ornamental flower, but yellow leaves often appear in the process of planting in summer, which makes many flower friends very distressed. They can't find any reason or start. Therefore, Xiaobian specially collated the relevant information, hoping to help you!
The reason of Pelargonium yellow leaf in summer the reason of Pelargonium yellow leaf in summer
1. The old leaves turn yellow due to changing environment. Many flower friends will move Xiaotian from outdoor flower rack to indoor, or from Nanyang platform to Beiyang platform, or from full sunshine outdoor to corridor, or put sunshade net on flowers before high temperature in summer. The growth environment will suddenly change greatly, which will cause the old leaves of Geranium to turn yellow and flower buds to dry. We don't have to worry too much. Xiaotian has a process of adapting to the new environment. We just need to pinch off the yellow leaves and dried flower buds. Other things are under normal management.
2. The new leaves turn yellow caused by high temperature. This is due to the high temperature in summer, which affects the root system to absorb iron from the soil, resulting in the appearance of high temperature and iron deficiency yellow leaves and white leaves. When the iron deficiency was mild, the mesophyll tissue of tender leaves was light green, and the vein remained green; when the iron deficiency was severe, the tender leaves were all yellow white, and appeared withered spots and gradually withered and fell off. There is no need to worry too much about this situation. Chelated iron solution can be sprayed and watered. Once a week, after 3 times, it can basically return to normal. In addition, reduce the ambient temperature, such as moving to a ventilated and cool place or air-conditioned room, the blade will slowly return to normal.
Because of the new leaf yellowing phenomenon caused by high temperature
The yellowing and whitening of new leaves are serious, and some leaves have appeared dead spots
3. Yellow leaves caused by drought in basin soil. Some flower lovers may misunderstand the problem of proper water control of geranium in summer, so they let the basin soil dry completely for a long time before watering, causing the leaves of Geranium to turn yellow and fall off from bottom to top, and in serious cases, the petioles droop and wilt. In this case, we need to adjust the watering method, and use the principle of alternating dry and wet to water the small day.
4. Yellow leaves caused by excessive waterlogging of basin soil. Due to the frequent and excessive watering, the basin soil is too wet for a long time, and the high temperature, part of the root system of Pelargonium wilfordii rots, which is shown in the leaves that the old leaves have no obvious change, and the tender leaves turn pale yellow. Serious old leaves will also appear yellow leaf shedding phenomenon. This requires immediate water control, loose basin soil placed in a ventilated dry place, accelerate evaporation of water. Or put the flowerpot on a stack of newspapers or dry peat to let the newspapers and peat suck out the excessive water in the pot as soon as possible. If the situation is particularly serious, the whole soil block can be removed from the basin and placed in the dry peat or soil pile to make the water seep out quickly. After the drooping branches and leaves recover, they can be replanted into the basin.
5. Starvation caused by malnutrition. Pelargonium flowers diligently, and flowers will consume a lot of nutrients. Spring is the full bloom period of Xiaotian. They spare no effort to bloom and bring a lot of happiness and joy to the flower friends. If we do not apply fertilizer properly in time, yellow leaves will appear after flowering. The main characteristics are that all leaves change color, new buds do not appear, or new leaves are small and thin and develop slowly, and the diameter of stem is obviously thinner. In this case, it is necessary to first dilute and then thicken, and gradually increase the fertilization concentration for topdressing, so as to prevent excessive fertilization at one time from causing burning seedlings, until the color of leaves returns to normal. In order to prevent this situation, first, we can apply fertilizer properly during and after flowering to make Xiaotian accumulate enough nutrition before the summer heat. Second, we can remove the flower buds in summer to ensure Xiaotian has enough physical strength to resist the heat and spend the summer safely.
On the left side of the picture is the phenomenon of yellow leaves lacking fertilizer after two rows of flowers
6. Excessive fertilization or high concentration caused yellow manure. Too much fertilization or too high concentration will cause root burning and rotten phenomenon, which is reflected in the old leaves yellow, young leaves thick, shiny and uneven. At this time, we need to control fertilizer, plough and water. If the fertilizer damage is serious, the basin should be poured immediately, part of the old soil should be removed, the soil lump should be washed with water, and the plain soil without fertilizer should be replaced, so as to root again.
7. Physiological yellow leaf. For example, after transplanting, due to temporary malnutrition, a small amount of yellow leaves fall off; The yellowing and shedding of leaves on the inner side of the plant due to insufficient light, the yellowing of old leaves after germination of new branches and leaves, the edema disease and yellowing of leaves caused by high water in the sky, and the great changes in the environment of potted flowers (such as moving from outdoor to indoor suddenly in midsummer or just entering the room in winter) all belong to physiological yellow leaf phenomenon. Because the yellow leaf also hopes to recover its vitality as soon as possible, it will absorb the nutrition accumulated by the plant itself, and the nutrition consumed by it is greater than that produced by it. So we don't have to worry too much, just remove the yellow leaves in time.
Physiological yellow leaves of Pelargonium
8. Yellow leaves caused by diseases and insect pests. If Pelargonium is infected by fungi, viruses and other pathogens, it will cause a variety of leaf spot, gray mold, local tissue necrosis, chlorotic yellow spots or mottled yellow green phase, or the whole leaf yellow off. Damaged by red spider, white Planthopper and other pests, chlorophyll is destroyed, leaves also appear yellow and white spots, or leaf color yellow fall off. This requires timely spraying according to the causes of diseases and pests.