What to do if the leaves of the gardenia turn yellow and wither
Do you know these? Information about gardenia leaf yellowing and withering, and the experience of green plant maintenance regarding the causes and solutions, will be introduced to netizens by the site editor next.
Friends who have raised gardenias know that gardenias are very prone to yellowing leaves, and there are many reasons for this. A gardenia enthusiast who has raised gardenias for 10 years summarized some common causes of gardenia leaf yellowing for me. Everyone can compare these with their own situation and then solve the problem accordingly, without having to ask for help and solving the yellowing leaf issue on their own.
1. Overwatering
Manifestation: The leaves turn yellow from bottom to top, the old leaves turn yellow first, the veins are green, and then the entire leaf turns yellow gradually.
Low temperature water yellowing
Causes: ① Poor indoor ventilation. ② The potting soil is too sticky and fine, with poor water permeability and aeration, as well as good soil moisture retention, and excessive watering. ③ Frequent watering and soaking the pot. ④ Sudden temperature drop when the soil is moist.
Potting soil too sticky causes excessive water
⑤ The new pot is too large, the newly filled soil layer is too thick, and the gardenia roots can't reach the edge of the pot during the seedling stage. ⑥ The bottom branches and leaves are too dense, affecting the ventilation and aeration of the soil surface. ⑦ Sandwich soil, with nutrient-rich soil inside and loess outside in the new pot, or loess inside and nutrient-rich soil outside. ⑧ Extremely cold air-conditioned rooms in summer. ⑨ Poor pot aeration, poor heat dissipation and insulation.
Everyone can judge according to their own situation, it may be caused by one reason, or it may be caused by multiple reasons together, and then determine how to solve it.
2. Over-fertilization
Manifestation: The veins of the old leaves of the gardenia turn yellow first, while the surrounding area remains green.
Causes: The concentration of the fertilizer applied to the gardenia is too high.
Solution: If this situation is found, immediately change the water and soak the pot (multiple times), or water the roots, which means to pour very fine water continuously for about half an hour, the purpose of which is to dilute the overly concentrated fertilizer in the soil.
3. Iron deficiency yellowing
Manifestation: The new leaves of the gardenia turn yellow, specifically, the veins are green and the leaf flesh is white-green.
What to do if gardenia leaves turn yellow and wither
Causes: Lack of iron.
Solution: Use brewed alum fertilizer water (a black-green liquid made by fully fermenting a mixture of ferrous sulfate, dung, cake fertilizer, and water in the ratio of 1:3:5:100) or spray the leaves with ferrous sulfate and white vinegar, or pour it directly. The alum fertilizer water has a significant effect, and after浇根 (watering the roots) once, it will show significant improvement within a few days.
4. Soil pH too alkaline
Most flowers in the south prefer acidic soil, while the soil in the north is alkaline, which can cause gardenias from the south to suffer from alkali damage, leading to leaf yellowing.
Solution: Replace with peat soil or cultivation soil mixed with 0.1% sulfur powder. These southern flowers should be watered with ferrous sulfate water once a week; keep the potting soil loose and well-drained; or use rotten grass water, and after the grass rots, use the supernatant liquid to water the flowers, which can reduce the occurrence of alkali damage.
5. Hard water in the north
In addition, most of the water in the north is hard water (water containing a higher amount of soluble calcium and magnesium compounds). Using hard water to water flowers can increase the calcium content in the soil, causing it to become compacted, which is not conducive to root growth, and can cause the leaves to turn yellow and wither gradually.
Solution: Water once every 2-3 weeks with vinegar water, or spray it on the plants. The method is to add 2 tablespoons of vinegar to 1 liter of water, which can prevent the leaves of southern gardenias from turning yellow and help them grow better.
6. Other reasons