Answer: Generally speaking, leaves of sun loving plants will become larger in the shade as the plants become light starved and attempt to increase the leaf surface to maximize photosynthesis. Excessive nitrogen can also increase leaf size, however, so light is not the only variable contributing to that. And, overall condition of the plant can affect leaf size. A plant that is stressed may become dwarfed -- as for example, bonsai which miniaturize in response to their cramped root space. I hope this helps.
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