What causes yellow leaves on roses
In China, roses are considered symbols of assassins and knights due to their thorny stems, while in the West, roses are regarded as symbols of strict secrecy. When a guest sees a rose painted above the host’s table, they understand that everything discussed on this table cannot be disclosed. But the deepest impression we have of it is undoubtedly the expression of love between lovers. Among flower enthusiasts, there are many who grow roses and encounter situations where rose leaves turn yellow. Let’s learn about the reasons for rose leaf yellowing and how to solve them.
Environmental reasons
Newly purchased roses are in the adaptation period and may have a small amount of yellow leaves, which is normal. As long as they are carefully maintained, they can be adapted for a period of time.
Reason for watering
If the leaves are dark yellow and lack luster, the old leaves show no significant changes, the branches are small and yellow green, and the new shoots do not grow long, it indicates excessive watering. In this case, we only need to pause watering and wait for the soil to dry before watering again. When watering, be careful not to over water; If the leaves curl and turn yellow, it is due to insufficient watering, and it is necessary to replenish water in a timely manner. When watering, pay attention to watering thoroughly and thoroughly.
Reason for lighting
Strong direct sunlight can easily cause withering of leaf tips and edges, and yellow spots appear on the sunny parts of leaves. In summer, excessive sunlight at noon requires shading treatment; Long term exposure to shaded environments results in insufficient sunlight for the leaves to form chlorophyll, causing the entire plant to turn yellow and eventually fall off. The plant can be moved to a well lit area, but should not be exposed to direct sunlight.
Temperature reasons
Excessive temperature can cause leaves to curl and turn yellow, and the plant as a whole will lose its color. You can place the plant indoors in a cool and shaded area to remove it; When the temperature is low in winter, plants are in a dormant period, and their leaves turn yellow and fall off, even becoming bare stems. We can keep them warm appropriately, and the temperature should not be lower than 8 degrees.
Reason for Fertilization
The new roots turn yellow and the leaves become lighter in color, appearing light green. They gradually turn yellow and dry in the future. This is a symptom of long-term fertilizer deficiency and requires appropriate supplementation of nutrient solution, but excessive fertilization should be avoided; The yellowing and withering of old leaf tips is a symptom of excessive fertilization, and it is necessary to pause fertilization until a large number of new shoots emerge in spring, and then supplement with topdressing according to the growth situation. We can also use commercially available flower fertilizers, such as Liyuan Biological Ziqi Garden Organic Flower Fertilizer and food grade nutritional supplements, to improve the soil environment and provide long-term and stable nutrition for plant growth.
Other reasons
The flowerpot is not breathable. When the pot is large and the roots are small, it is necessary to avoid long-term moisture in the soil, which may cause root rot. At this time, it is necessary to replace the flowerpot with a breathable one and place the plant in a dry place.
The correct method for raising roses
Adequate sunlight, suitable temperature of 15-25 ℃, requires more than four hours of scattered light per day; Select soil, mix 5:3:2 decomposed leaf soil, perlite, and river soil, and add decomposed organic fertilizer as base fertilizer; Water and fertilizer management, watering once every 5 days in spring and autumn, once every 3 days in summer, once every 8 days in winter, and applying phosphorus and potassium liquid fertilizer once every 15 days during the growth period; Trim and prevent insects, remove diseased branches and redundant leaves from the roots, and use multi spirit bacteria for prevention.
Adequate lighting
The suitable ambient temperature for roses is 15-25 ℃, and indoor maintenance is needed in winter when the temperature is low. Like sufficient light, belongs to positive plants, and requires more than four hours of scattered light per day for maintenance, which is beneficial for the growth and development of the root system. It can make the petals more vivid, the fragrance of flowers more intense, and reduce the risk of disease and insect infections.
Choose soil
When cultivating roses, you can choose to mix humus soil, perlite, and river soil in a ratio of 5:3:2 to make nutrient soil. You can add some decomposed organic fertilizer to increase soil fertility. After the preparation is completed, it needs to be disinfected and placed in a ventilated place. Lay a layer of granular soil at the bottom of the flowerpot during planting to increase the soil’s permeability.
Water and fertilizer management
Roses are drought resistant. They should be watered every 5 days in spring and autumn, and every 3 days in summer to prevent dehydration due to high temperatures. They should be regularly sprayed with water on the leaves and surroundings to keep the air moist. In winter, when the temperature drops, they should be watered every 8 days. Diluted phosphorus and potassium liquid fertilizer, such as Huaduoduo No.2, should be applied every 15 days during the growth period. It is recommended to apply less or no fertilizer in summer and winter.
Trim and prevent insects
Rose cultivation requires timely pruning, which is beneficial for the flowers to bloom and grow healthily. Cut off the yellowed and withered diseased branches and redundant leaves from the roots to increase air permeability and reduce the occurrence of pests. Common diseases include rust, branch blight, and spider mites, which need to be prevented in advance. If already infected, multi pathogen control can be used.
Original article author：Fragrant Road Full，If reprinted, please indicate the source.：https://www.theroadfull.com/article/3844.html