Why do the leaves of potted flowers turn yellow?

There are many different reasons why the leaves of potted flowers turn yellow. The main reasons are as follows:

Yellow leaves caused by too little or too much water: when flowers lack water, the leaves turn dry and yellow; too much water easily causes the roots to rot, so that the flowers cannot absorb water and nutrients, and the leaves turn yellow and finally fall off, causing death.

Yellow leaves from scorching sunlight: if the sunlight is strong and scorching, it will burn the flower leaves and make them turn yellow.

Yellow leaves caused by too much or too little fertilizer: applying too much concentrated fertilizer burns the roots, so that they cannot absorb water, and the leaves wither and fall. Likewise, when fertilizer is lacking, the flower leaves turn yellow, thin and weak, and the branches are slender, yellow and tender.

Yellow leaves from excessive alkalinity soaking the leaves: because potted flowers are watered for a long time, salt and alkali accumulate in the pot. In serious cases, an alkali crust forms on the potting soil, causing the flower leaves to fall off. This is especially true in the north, where both water and soil contain alkali. The method is to replace the soil or apply ferrous sulfate solution to neutralize it.

Yellow leaves caused by too much or too little acid: some flowers prefer acidic conditions. If the pH value exceeds 7, the areas between the veins of the new leaves at the branch tips turn yellow first, and the edges of the old leaves wither and yellow, finally falling off and dying.

Yellow leaves caused by too small a pot: the plant has many roots and therefore needs more water and nutrients, and a small pot cannot meet the growth needs of the flower. The old leaves of the plant appear dry and yellow without luster, and it even spreads until the tender leaves also turn yellow.

Yellow leaves caused by cold wind and low temperature: if flowers are moved outdoors too early in spring, they are prone to cold and wind, which freezes the flowers and makes the leaves turn yellow.

Yellow leaves from pests and diseases: for example, powdery mildew and brown spot disease make the leaves wither, yellow and fall. For example, whiteflies, red spiders, mites and others suck nutrients and water from the underside of the leaves, which can also cause the leaves to wither and yellow.