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The most common cause of marijuana leaf cupping aka leaf margin rolling, leaf margin burn, and leaf tip curl/burn is overzealous use of marijuana plant food. In relationship to factors such as marijuana plant vigour and rate of growth. Leaf burn is often the very first sign of too much marijuana fertilizer.
In these conditions, some female marijuana plants will grow staminate flowers (which are male) in order to produce their own pollen, fertilize their own pistil flowers (female) and produce seeds which will grow again the following season. Male marijuana plants will sometimes grow pistil flowers, but this is less common. Early feminized marijuana seeds usually were made with two female marijuana plants, one of which had been identified as having hermaphrodite tendencies, i.e. prone to produce male marijuana flowers when it was stressed.