These 6 reasons for the yellowing leaves of the Chinese rose won't let you escape, quickly see which one you have hit?
Today's focus is to introduce the small knowledge of gardening about why the leaves of Chinese roses turn yellow, and see which one you have hit. The detailed content will be shared next.
In the past few days, many flower friends have consulted about the problem of yellowing leaves in Chinese roses. Some of them are caused by improper cultivation, and others are natural metabolic phenomena. Today, let's specifically introduce the factors that can cause yellowing leaves in Chinese roses.
1. Metabolic yellowing leaves of Chinese roses
Now is the peak season for the growth of Chinese roses. Attentive flower friends will find that the leaves near the bottom often show yellowing, which is actually a normal metabolic yellowing.
The characteristic of metabolic yellowing leaves is that old leaves occasionally turn yellow. In early spring, when Chinese roses germinate, the temperature is often unstable, fluctuating up and down, so the growth of Chinese roses is slow. These leaves experience unstable temperatures, and after spring warming, when Chinese roses grow rapidly, the bottom of these old leaves receive very little sunlight and have poor ventilation, which can easily lead to yellowing and falling off. This is a natural metabolic phenomenon and there is no need to worry. Just clean up the yellow leaves in time.
2. Yellowing leaves due to excessive watering
The yellowing of Chinese rose leaves is most afraid of waterlogging. Once yellowing leaves occur due to excessive watering, it is difficult to deal with. Chinese roses are neutral flowers and cannot be too wet or too dry. Watering must be thorough, wetting the soil completely and allowing it to dry before watering again.
If the Chinese roses have waterlogging symptoms due to excessive watering, there will be large areas of yellow leaves, and both old and new leaves may turn yellow. This is mainly judged by checking the moisture of the potting soil.
3. Yellowing leaves due to excessive drought
Chinese roses can also have yellow leaves due to excessive drought. Drought-caused yellowing is mainly manifested by the mass yellowing and falling off of the bottom old leaves, and it can be found that the potting soil is very dry.
For yellowing leaves caused by drought, just clean up the yellow and fallen leaves and water thoroughly to recover.
4. Infection with diseases (black spot disease)
If Chinese roses are not properly cared for, they can easily get black spot disease, which can also cause a large number of yellow leaves. The main manifestation of black spot disease is black or brown spots on the leaves, which can be accompanied by yellowing and falling off of the leaves in severe cases.
Leaves that have fallen due to black spot disease in Chinese roses must be cleaned up, and fungicides such as mancozeb, carbendazim, and myclobutanil should be sprayed for treatment.
5. Infection with pest insects
If Chinese roses are not well ventilated, they are more likely to be infected with red spider mites. These are very small mites that gather on the back of Chinese rose leaves to absorb sap, causing pinhead-sized spots that are dense and can also cause yellowing of the leaves.
Chinese roses with red spider mites should be treated promptly with miticides such as pyridaben, jinmanzhi, aikarmitin, and abamectin. Spray every 5-7 days, and continue for 3-4 times for complete cure.
6. Yellowing leaves due to nutrient deficiency
Chinese roses require a lot of trace elements, such as calcium, iron, and magnesium. Especially for potted Chinese roses, if the soil mixture is not reasonable, it is easy to have a nutrient deficiency, leading to yellowing of new leaves.
When yellowing of new leaves and multiple blind buds are observed in Chinese roses, trace element fertilizers can be sprayed on the leaves. Sometimes it may be difficult to distinguish which specific element is deficient, so a "one-size-fits-all" approach can be adopted, using a mixed formula of trace element fertilizers. This way, calcium, iron, magnesium, zinc, and others are all supplemented at once, and usually, effects can be seen within 1 week after spraying.
Have you clarified the situations of yellowing leaves in Chinese roses? Only by identifying the correct cause of yellowing leaves can you treat it symptomatically and make your Chinese roses grow vigorously and bloom more.
The above sharing about the yellowing leaves of Chinese roses that you can't escape these 6 reasons, see which one you have hit, is all for your comprehensive understanding and reference!