Over the past few days, many flower lovers have asked me for advice about yellow leaves on roses. Even though I have previously shared preventive measures for yellow leaves in spring roses, there are still a lot of florists who encounter this problem and feel overwhelmed.
Common Causes of Yellow Leaves in Spring Roses
March is a time of vigorous growth for roses, with branches stretching rapidly almost every day. By the end of March to early April, roses begin to grow flower buds. Many florists are excited to see roses blooming with many buds. However, they soon noticed that the roses were showing a lot of yellow leaves at the bottom. This made many people start to worry: was it over-fertilized? Or is it sick?
In fact, when roses start to grow buds at the end of March to the beginning of April, the top branches and leaves will become very lush, while the old leaves at the bottom will naturally yellow and fall off due to insufficient light and poor ventilation, as well as the fact that these leaves have been growing for a long time and have completed their mission. This is a normal metabolic process, no need to worry too much.
Especially for the new seedlings just purchased, after express transportation, after a few days of boredom in the box, will accelerate the aging speed of these leaves. Therefore, it is very common for the bottom leaves to turn yellow in large numbers within three or four days after receiving new seedlings. Simply clean off the yellow leaves and maintain good ventilation and sufficient light.
In addition to yellow leaves caused by natural metabolism as mentioned above, drought is also one of the reasons for the high incidence in spring. Spring is the season of rapid growth for roses, which consumes a lot of water. If the pot is small and placed outdoors, the soil may dry out in a day. If not watered in a timely manner, roses are prone to drought and usually show signs of extensive yellowing of the leaves within one to two days.
This is especially common in newly transplanted roses. Because the roots of newly transplanted roses have not yet fully acclimatized to the new soil, in warmer temperatures the water in the original soil may be quickly depleted while the new soil remains moist. Many florists will be afraid to water because they mistakenly think the soil is still wet.
For newly transplanted rose seedlings, watering should be based on the dryness of the original soil. If the original soil is already dry, you will need to replenish the water in a timely manner so that the roses are not damaged due to lack of water.
In addition, black spot disease is more prevalent this season. If you find dark brown spots on the leaves of roses, you should use fungicides to spray and treat them in time. Otherwise, the aggravation of the disease will lead to massive yellowing and shedding of leaves. Commonly used fungicides include fusonazole, flusilazole and oximinazole. It is important to note that black spot is all about prevention, and you should usually spray regularly to prevent the disease.