Gardenia leaves turning black
This article is about the content of Gardenia in the flower clinic. The leaves of Gardenia are turning black. Next, the editor will introduce to the netizens.
There are two possible reasons for the black leaves and drooping leaves of Gardenia:
First, excessive watering: generally, the watering time of plants is when the surface soil feels a little dry, and it is best to water before 9 a.m. and 5-7 p.m. in the evening. Each time, you should water thoroughly. When the climate is relatively humid, the plant's evapotranspiration is slow, and watering twice a day can easily cause the roots to be unable to breathe normally or even rot. Since the roots in the pot are not visible, the aboveground parts, such as leaves, will show symptoms such as yellowing, drooping, leaf falling, and withering. At this time, you can dig up the plant to see if the roots have rotted, cut off the black roots and plant them again, and water according to the above method.
Second, tea soot disease caused by pest damage
There are three kinds of pests that can cause soot disease. If you can't identify them, please refer to books:
1. Aphids: often light green, about 3mm, mostly aggregated on the soft parts of new buds and young buds. Pound two garlic cloves into juice, add 1 liter of water, and then spray the diseased plant.
2. Mealybugs: white, about 2-3mm, mostly found on the back of leaves. Mix 1g of laundry detergent with 120cc of water and a few drops of peanut oil or corn oil, stir well and spray or use a brush to remove by wetting.
3. Scale insects: various types, brown, white, or light yellow, about 1.5-3mm,吸吸取茎,枝,叶的汁液,成虫不会移动.用棉花棒沾酒精或肥皂水清除。
If the above methods still do not work, you need to use insecticides.
Key points of Gardenia management:
1. Cultivation site: Gardenia likes warm and humid climate, with a suitable growth temperature of about 20℃, and should be selected in a semi-sunlit area, not exposed to strong sunlight, and should be slightly shaded at noon in summer and protected from the cold in winter.
2. Soil: prefers deep, fertile, slightly acidic, fertile, and well-drained humus soil. Potted plants should be repotted once a year, with organic fertilizers such as bone meal or active organic fertilizers placed at the bottom of the pot, covered with 8-10cm of soil, and then the plant is placed in it.
3. Fertilization: After planting, apply a long-acting fertilizer such as Haokang No. 1 every 3 months, and apply it away from the base.
4. Pruning: After 2 years of planting, prune dense branches, dead branches, diseased branches, suckering branches, or branches too close to the ground every spring to facilitate air circulation and direct sunlight.
The above [] introduces the full content of what to do if the Gardenia leaves turn black, hoping to be helpful to the green plant lovers!