What causes gardenia leaves to turn yellow in winter?
Gardenia is a very common flowering plant in our daily life, and it is grown on a very large scale in China. However, when growing gardenias, many problems often arise that affect their growth. Especially in winter, gardenias are highly prone to yellowing leaves in winter. So what causes gardenia leaves to turn yellow in winter? Below, the editor will give you a brief introduction. Let's take a look!
1. Temperature too low
Too low a temperature is one of the main causes of gardenia leaves turning yellow in winter. This is because in winter, temperatures are generally quite low. If the winter temperature is below 5°C, then gardenia leaves are highly susceptible to frost damage, making yellowing leaves likely, and in severe cases this can cause frost injury or even death. So when growing gardenias in winter, if the temperature outdoors is below 5°C, then you should promptly do a good job of keeping them warm. You can move them indoors to grow them or cover them with a plastic bag, then open it every day at noon for ventilation.
2. Overwatering
In winter, because the temperature is relatively low, the rate at which water in the soil evaporates is also relatively slow. If you still water according to the previous watering frequency, then because the soil moisture evaporates too slowly, water will accumulate in the soil. This causes the roots to become waterlogged and rot, leading to yellowing of the plant's leaves. So when winter temperatures are low, we should pay attention to controlling watering well and appropriately extend the watering interval. Water again when the soil is very dry. You can also insert a bamboo stick into the soil; if the bamboo stick comes out dry when pulled out, then you can water.
3. Lack of light
Natural light in winter is relatively short, and the light intensity is not very strong either. Gardenia growth has a relatively large demand for light, so in winter, if gardenias are kept in a weak-light, dark environment for a long time, then it will have a very large impact on gardenia growth, causing gardenia leaves to turn yellow. Winter sunlight is generally relatively mild, so we can let gardenias receive sunlight directly to promote nutrient accumulation. If natural light is insufficient, then we need to do a good job of artificial supplemental lighting.
4. Improper fertilizing
In winter, because of the low-temperature environment, gardenia plants generally enter a dormant period. And once gardenias enter the dormant period, their ability to absorb fertilizer is relatively weak, so in winter we must not fertilize indiscriminately. If fertilizing is improper, gardenia plants cannot effectively absorb it, and fertilizer damage is also likely, thereby causing yellowing leaves. So in winter, it is best not to fertilize, to ensure gardenias safely overwinter. Wait until the spring of the following year and appropriately apply alum fertilizer water to supplement nutrients.
The above is a brief introduction to what causes gardenia leaves to turn yellow in winter. That's all for today's introduction. This article is for reference only, and I hope it can be of some help to everyone!