Herbs are either perennials or annuals in the garden. Perennials like sage, thyme, lavender, chives, and mint do not need to be replanted each year. Annuals like basil and cilantro will not survive a proper winter, so they must be replanted each spring. Meanwhile, dill, fennel, and a few other annual herbs actually reseed each year. So, once planted, they often return year after year; not necessarily in the place in the garden though!