If the gardenia leaves turn yellow and have black spots, it may be due to disease, or improper watering and fertilization during the maintenance process, which will cause the gardenia leaves to turn yellow. Moreover, if gardenia grows in a dark environment for a long time and lacks light, plant growth will also have problems. The yellow leaves need to be pruned and treated in time. Let me tell you in detail below.

1. Pests and diseases

Gardenia flowers are prone to disease in environments with high temperature, high humidity, and poor ventilation. Leaves infected with pathogens will become moldy and develop black spots. They can be disinfected with Use good scissors to cut off the yellowed leaves with black spots, and place them in a place with astigmatism to slow down the seedlings for 5-8 days. They can be maintained normally in the later period.

2. Improper watering

Long-term under-watering or over-watering of gardenias will cause the leaves to turn yellow and fall off. Water immediately when the soil is dry, water thoroughly and avoid stagnant water. In summer, you can increase the amount of watering and spray water on the leaves and around the plants to maintain sufficient humidity. Plants grow slowly in winter, so reduce watering as much as possible and don't let the soil get too wet. When over-watering, place the potted plant in a well-ventilated place in time to promote rapid evaporation of water.

3. Improper fertilization

Yellowing of gardenia leaves may be due to fat damage. When fertilizing, fertilizer should be applied frequently and thinly. Fertilization is prohibited during the dormant period. During the growing season of gardenias, fertilize once every 15-20 days. Use thin decomposed fertilizer water instead of raw fertilizer directly.

4. Insufficient light

Gardenia likes sunlight and can be grown in a sunny courtyard or balcony. When grown indoors, it can be placed on a windowsill facing the sun or in a place with astigmatism. It cannot be grown for a long time. Breed in a fully shaded environment, otherwise plant growth will be greatly affected, with leaves turning yellow and falling off, etc.