Have you encountered these common issues with early spring roses?
For most women, the introduction to the green plants and flowers commonly seen with these early spring roses, let's take a look together.
Early spring roses, each new bud naturally brings to mind the beautiful full blooms on the trees. However, if you find that the new buds of the roses have black edges or are covered with small green insects on the red branches, it can cause significant harm to our roses, and immediate action is required.
Rose New Bud Black Edge Causes and Solutions
In early spring, it is common for the new buds and leaves of roses to have black edges. Summing up the causes, there are roughly three main reasons.
1. Fertilizer Damage
Rose fertilizer damage is very common in early spring, especially for those who fertilize frequently. When seeing the roses sprouting in early spring, they tend to apply a large amount of water-soluble fertilizer. However, the air temperature in early spring is much higher than the temperature of the potting soil. Therefore, the new buds of the roses grow quickly, but the root activity is not very high. Applying a large amount of water-soluble fertilizer at this time can easily cause fertilizer damage and blackening of the new spring buds.
Fertilizer damage caused by water-soluble fertilizers needs to be mitigated by promptly watering with a large amount of clean water.
In addition to water-soluble fertilizers causing fertilizer damage, improper use of base fertilizers can also cause burning of rose buds and blackening of leaf tips. Therefore, when repotting roses in winter, the base fertilizer must be chosen correctly and should not come into contact with the rose roots.
For specific rose repotting methods and the selection and use of base fertilizers, you can refer to the introduction in the book "How to Grow Roses from Scratch" that I have written, which is very comprehensive.
2. Pesticide Damage
In addition to fertilizer causing black leaf tips, pesticide use can also cause new rose buds to turn black due to high concentration burns. Therefore, when applying pesticides, it is important to strictly follow the mixing instructions.
Once pesticide damage occurs, there are no good ways to mitigate it. You can only rely on the roses to grow quickly and metabolize the pesticides.
3. Excessive Humidity
Sometimes, even though we do not spray pesticides or fertilize our outdoor roses, new leaves still turn black. How can we explain this? In this case, we need to look for reasons from the environment.
Firstly, we need to check if it has been humid recently, such as frequent rain or very high air humidity.
Especially with the recent heavy rains, the phenomenon of new rose leaves turning black has also increased. Because on cloudy and rainy days, the air is very humid, and with light rain or dew at night, the moisture accumulates on the leaves of the roses, hanging on the leaf tips and not dissipating in time, which can easily cause leaf cell rupture, leading to leaf tip tissue withering and blackening.
Moreover, high humidity can easily cause diseases. When new leaves are infected with pathogens, they also tend to have black leaf tips. In this case, you need to spray pesticides to avoid further disease spread. You can use mancozeb or carbendazim for spraying.
Rose Aphid Control Methods
Aphids are the most common pest affecting early spring roses, and although small in size, they can cause significant damage.
Aphids reproduce very quickly and gather on the tender tops of roses to absorb sap, which can cause abnormal growth of new branches, deformation of flower buds, and curling of leaves.
When aphids are found on roses, it is important to spray pesticides promptly to kill the pests. Aphids can be controlled with dinotefuran, which has good insecticidal effects and long-lasting efficacy. Indoors, on a balcony, you can also spray with diluted peppermint oil (200 times), which also has a noticeable effect.
The above shares a comprehensive introduction to the common issues with early spring roses. I hope it brings some knowledge about green plants to green plant enthusiasts.