TheNaturePlanet

Roses, known as the "queen of flowers", often cause troubles for flower enthusiasts due to the phenomenon of "black stems" during the process of their maintenance. In order to ensure your rose bushes grow healthily and vigorously and bloom charming flowers, we deeply explore the causes of black stems in rose bushes and provide effective treatment methods.
Causes of black stems in rose bushes
During the growth process of rose bushes, they are prone to being attacked by various germs, such as black spot disease, downy mildew, etc. Once these germs invade the interior of the plant, the stem tissue will be damaged, resulting in the phenomenon of black stems.
Pruning is an important link in the maintenance of rose bushes. However, if the pruning tools are not disinfected or the wounds are not properly treated after pruning, germs can easily invade from the wounds and cause black stems. Excessive watering will lead to water accumulation in the soil, causing the roots of rose bushes to lack oxygen, thereby affecting the absorption of water and nutrients. After the roots are damaged, problems will occur in the stems, manifested as black stems.
Excessive fertilization can cause root burns and affect the normal growth of the plants. In severe cases, the stems will turn black, affecting the health of the rose bushes. In cold winters, if no effective heat preservation measures are taken, the stems of rose bushes may suffer from freezing damage, resulting in black stems.
The growth of rose bushes requires a good ventilation environment. If the planting environment has poor ventilation and high humidity, it is easy to breed bacteria and fungi, increasing the risk of black stems.
Treatment methods for black stems in rose bushes
Once black stems are found in rose bushes, pruning should be carried out immediately. Use a sharp and disinfected pair of scissors to cut off the black stem part until healthy tissue is exposed. When pruning, note that the incision should be oblique to facilitate wound healing. The pruned wound should be disinfected. Fungicides such as carbendazim and chlorothalonil can be applied to prevent reinfection by germs.
Strengthen ventilation, maintain air circulation, and reduce humidity. Water reasonably to avoid water accumulation and follow the principle of "water when dry and stop when wet". Control the amount of fertilization to avoid excessive or concentrated fertilization. If black stems are caused by germ infection, corresponding drugs should be used for prevention and treatment in a timely manner. For example, for black spot disease, drugs such as azoxystrobin and flusilazole can be used; for downy mildew, drugs such as propamocarb and dimethomorph can be used. Dilute and spray according to the instructions of the drugs, paying attention to uniform spraying, including both sides of the leaves and the stems.
Fertilize rose bushes regularly to provide sufficient nutrients and enhance the resistance of the plants. Compound fertilizers rich in elements such as nitrogen, phosphorus, and potassium, as well as organic fertilizers, can be selected. At the same time, pay attention to supplementing trace elements to promote the healthy growth of the plants. Before the onset of winter, take heat preservation measures, such as covering with insulation materials and moving the rose bushes indoors, to avoid freezing of the stems.
Understanding the causes of black stems in rose bushes and taking corresponding treatment methods are the keys to ensuring the healthy growth of rose bushes.