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Yellowing orchid leaves are related to fertilisation methods
Fertiliser yellow: when too much fertiliser is applied, especially too much nitrogen fertiliser combined with a lack of phosphorus and potassium fertiliser, it easily causes the leaves to turn yellow, showing as new leaves that are thick and fleshy with mostly uneven surfaces, while old leaves gradually turn yellow and drop off; in severe cases the leaf tips dry out and even the entire leaf becomes scorched yellow. When this happens, fertiliser should be applied immediately, the amount of watering increased, and the fertiliser...