The reason why the leaves of crabapple trees turn yellow

Causes of yellowing

Improper watering

During the high temperature dormancy period of crabapple in summer, the soil should be dry and not too moist, so watering should be reduced, otherwise the leaves will fall and the stems will wither, the entire root will rot, and eventually the whole plant will die. If the soil is too dry, it will become compacted, the roots will not be able to breathe, and the leaves will wither.

Lack of trace elements

During the growth process of crabapple flowers, the growth may be hindered due to the lack of certain trace elements. If the crabapple flower lacks iron, the leaves will turn yellow. A lack of magnesium can also cause yellowing leaves. These trace elements are important elements for synthesizing chlorophyll.

Insufficient or excessive light

Begonias like sunlight, but are not shade-tolerant. Insufficient light will cause the begonias to be unable to synthesize chlorophyll and their leaves to turn yellow. When the temperature is too high in summer, exposure to strong sunlight can also cause the leaves of the crabapple flowers to be burned or even wither.

Improper fertilization

Begonias need to be fertilized during their growing period. If there is insufficient fertilization and no base fertilizer, the plant will become short and the leaves will become thin and light or reddish. Too much fertilizer can cause fertilizer damage and the leaves will turn yellow. Overfertilization during the summer dormant period can also cause yellowing leaves.

Workaround

Reasonable watering

During the summer dormancy period of crabapple, reduce watering and spray water on the edge of the pot soil. But we can't just not give any water at all. Water requirements must also be met during the normal growing period.

Reasonable fertilization

Begonias should be fertilized in early spring, and topdressed after the leaves fall in autumn to supplement nutrients. You can usually use some special fertilizers. If you haven't fertilized the crabapple for a long time, apply a thin liquid fertilizer or compound fertilizer once a week or so. If the crabapple flower is iron deficient, you can spray ferrous sulfate to supplement the iron. If you are deficient in magnesium, you can apply some magnesium-containing fertilizer.

Reasonable lighting

In hot summer weather, avoid exposing crabapple flowers to the sun. In winter, when placing crabapple flowers indoors to keep warm, be sure to place them in a sunny place and not in a dark corner.