Why Are Geranium Leaves Turning Yellow? Causes and Solutions

Geranium is a perennial herbaceous flower with slightly woody stems and herbaceous branches and leaves. It blooms in a variety of colors with beautiful flower shapes, making it popular with many people. It is commonly suited to pot cultivation. The plant is relatively small and very suitable for growing on windowsills, so it is loved by many people. After growing geraniums, many friends find that the leaves easily turn yellow, and they do not know the reason or what to do. So now let us answer these one by one.

1. Low temperature

Old leaves at the base easily turn yellow naturally and finally fall off; this is normal. If the outdoor temperature is too low, it affects leaf growth and may cause yellowing, and eventually dropping. So during cultivation, keep it above 10 degrees, with nighttime temperature at least above 9 degrees, so leaves will not turn yellow due to cold damage. Placing it indoors is the best way to keep it warm.

2. High temperature

Extreme high temperatures cause leaves to lose water and turn yellow, scorch, and dry up. High temperatures often bring drought, and the root system cannot absorb water either. In severe cases, the whole plant will dry up. The solution is to move it indoors for care during high temperatures, preferably to a cool, well-ventilated place. After yellow leaves appear, supplementing iron can relieve it.

2. Fertilization

Sometimes too many rounds of topdressing or too much fertilizer makes the soil concentration too high, inhibiting root absorption and damaging the roots; the direct sign is yellow leaves. But if no fertilizer is applied for a long time, the plant lacks nutrients, and the leaves are the first to be unable to be supplied. The best way to fertilize is to fertilize on a schedule, applying fertilizer once per stage; you cannot go without fertilizing. Use an appropriate amount of fertilizer, a small amount in summer, and apply it after dissolving it in a large amount of water.

3. Humidity

If during the growing process there is high temperature and moisture, too much watering, or excessive moisture, the roots rot and become infected, and then the leaves grow poorly. Insufficient water easily causes drought and drying up. Just maintain a sufficient amount of watering; do not water every day, but about once every 3 to 4 days, so there will be no water accumulation. If there is no water accumulation, the roots will not rot.

4. Pests and diseases

Infection by pests and diseases may cause leaves to turn yellow. Infection by pathogens generally invades from the root system or spreads through the soil. Some insects may be carried by the soil, or may be attracted from outside. The best approach is, after discovering disease, to change the soil promptly, wash the roots and containers with medicinal solution, and use disinfected soil. If pests occur, catch them promptly, spray pesticide, and drench the roots with the pesticide.

Overall, geranium leaves turning yellow is caused by external factors, though there are also cases of internal nutrient deficiency. As long as nutrients are sufficient and it is grown in a suitable environment, and you pay attention to seasonal changes and give appropriate protection, there will be no major problems.