Like most herbaceous perennials, Hypoestes has seasonal behavior. It just wants to bloom late summer/fall. Hummingbirds & bees love these blooms. After the blooms finish, those older, gangly bloom stems are discarded and new growth emerges late winter/spring. My plants have always done this, whether potted inside or outside since I now live where it is hardy. To keep it looking its' best over winter, give more light than it needs while outside for summer, and as warm as possible.
