The yellowing and falling of gardenia flower bones is caused by improper lighting, excessively alkaline soil, sudden changes in the environment, too much watering, and too much fertilizer.

1. Insufficient light

Putting gardenias in a strong light environment or a dark environment for a long time will cause the leaves to be unable to carry out normal photosynthesis, and the nutrients accumulated in the body will be difficult to store. To meet the growth and development needs of the flower buds, the flower buds will grow thin and fall easily.

2. Sudden changes in the environment

Most of the gardenias I just bought have buds. At this time, the environment suddenly changes greatly, which can easily cause the formed flower buds to turn yellow or fall off. Plants need an adaptation stage and a good external environment needs to be provided. To provide scattered light, the soil must also be kept moist.

3. Watering too much

After the plant enters the period of growing flower buds, it should not be supplemented with too much water. If you water too much, a large amount of water will accumulate in the soil, which may affect the absorption of water and nutrients, causing the flower buds to drop. It is also possible that a large amount of water causes the branches and leaves to grow faster, and the flower buds are not supplied with enough nutrients, and the flower buds will fall off. Stop watering for a while. Then use a tool to poke holes in the soil to help water escape.

4. Applying too much fertilizer

Many friends think that the flower buds need a lot of nutrients, so they apply a lot of fertilizer. In fact, this is wrong, and it will easily cause the flower buds to fall. If the situation is not serious, you can use some water to rinse away the remaining fertilizer. If the situation is severe, then it is best to replace the soil.

How to grow gardenias:

1. Soil. Weed flowers like to grow in acidic soil containing more humus. It can be mixed with 4 parts of leaf soil, 4 parts of vegetable garden soil, 1 part of soybean meal and 1 part of river sand. It has good water permeability and air permeability, plus 0.5% black vitriol or sulfur.

2. Temperature. The growth and development temperature of gardenia is 20~25°C, and the optimum temperature for flowering is 26~28°C. Plants that have been cultivated for 4 to 5 years can tolerate short-term low temperatures of -3°C, and will suffer frost damage below -5°C. The leaves turn black and fall off, and the young branches freeze to death.

It is advisable to maintain indoor maintenance at 6~10℃ in winter and not lower than 0℃. If the room temperature is higher than 15°C, south-facing doors and windows should be opened, ventilated appropriately, and the temperature lowered. Otherwise, germination will easily occur and will be damaged by low temperatures, which is extremely detrimental to the growth and flowering of the next year.

3. Lighting. Gardenia likes sufficient light, especially in spring and autumn. It needs more than 8 hours of sunshine a day, otherwise it will be detrimental to its growth and survival in winter. Avoid exposure to strong light at noon in summer, otherwise the leaves will turn yellow. It should be placed in a place with astigmatism for maintenance, and the light transmittance should be 40~50%. In winter, place it indoors in a south-facing location exposed to direct sunlight