In our desert soils, yellowing of plant leaves is frequently because of a lack of iron available to plants. Plants need iron to make the green pigment in their leaves, and green stems, called chlorophyll. Even though iron is not a part of chlorophyll it cannot be made without iron. If the chlorophyll is not made, the color of the leaf stays natural. In most cases a leaf's natural color is yellow.Winter is the time of year when soil applied iron is not going to be effective. Liquid sprays applied to leaves can cause greening in 24 hours or less on warm days. In some cases it could be a bit longer.
iron chlorosis on cherry laurel
Yellowing on citrus |
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