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They have a magnesium deficiency.

Magnesium is a mineral that is important in making chlorophyll (the green pigment that makes leaves green.) So a lack of it means that the leaves go yellow.

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14y ago
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AnswerBot

6mo ago

Plant leaves turn yellow due to various reasons, including nutrient deficiencies (such as nitrogen or iron), overwatering, underwatering, pests, diseases, or environmental stress (excessive sunlight, low humidity). It is important to identify the specific cause in order to provide the appropriate treatment to help the plant recover.

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12y ago

Oncidium leaves turn yellow due to a natural process of loosing old growth. If the oncidium is in full sun, yellowing can be causd by too much sun. If you have had it for more than two years and leaves turn yellow it may be time to repot it. Rotting medium causes a nitrogen deficiency and causes yellowing of leaves

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13y ago

either because they have been over watered or because they have not gotten enough sunlight/energy or water. basically they turn yellow when they die, and those are the main natural reasons

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Q: Why do plants leaves become yellow?
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Related questions

What causes yellowing leaves on a Rhododendron?

I think it's a deficiency of nitrates, which help plants to produce chlorophyll, and which is the pigment that turns leaves green, and without it, leaves can become yellow.


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Leaves turn yellow in the absence of sunlight because they are not able to carry out the process of photosynthesis effectively. Without sunlight, the chlorophyll pigments in the leaves break down, causing the green color to fade and the yellow pigments become more visible. This ultimately leads to the leaves appearing yellow.


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If they are over or under watered they can turn yellow. But if kept in the dark they turn yellow because the chlorophyll (which gives plants its green hue) is unable to absorb energy from light to start the process of photosynthesis. If your plants are turning yellow, try and find a sunnier spot, or get a lamp for it.


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