Whether you should gift a baby plant or a full-grown plant; ultimately depends on the person receiving the plant and the plant type. Hoya hearts, for example, are cute succulents that should be gifted as singular baby plants. Unlike the Christmas cactus that will not reap its glory unless it has become somewhat full-grown, at least enough to produce blooms. Baby versus full-grown plants also depends on the care levels. Baby plants usually require more work than plants that have reached their peak.