Sugar leaf One of the small leaves growing among the flowers, often dusted with trichomes. Also called sugar leaves Read more about Sugar leaf Leaf Doctor Yellowing lower leaves: what it is, and when it’s nothing Before anything else: if you're six or more weeks into flower and it's only the bottom leaves, this is probably normal. Leaf Doctor Natural senescence: when yellowing leaves are supposed to happen Late in flower, your plant starts dismantling its own fan leaves on purpose.