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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.
Download my free marijuana grow bible for more tips about growing marijuana plants. Pollination occurs when pollen from the male marijuana plant reaches the female stigmas and finds its way to the egg cell of the female plant that is inside the pistil. After the process of pollination, the seed is produced. An interesting fact is that growers prefer sensimilla which is the name for cannabis plants that are not pollinated and do not have seeds. The structure of the female flower that is called glandular trichome produces resin on the flowers and leaves close to them.