Generally cultivated crops are grouped into any of the three categories based on their growing cycle. These categories are annuals, biennials and perennials. Annuals complete both their vegetative and reproductive life cycles within a season or a year. Biennials complete their vegetative growth phase during first growing season or first year and produce seeds during the second season or second year. That is, biennials complete their life cycles within two seasons or within two years. While perennials are those crops which may take one or more years to complete their vegetative phase before embarking on a continuum of reproductive cycles, yielding economically significant crop produce. That is, perennials grow for several years without compromising on their economic value. Similarly, perennial vegetables are those crops that produce edible portion that can be used as a vegetable continuously for several years. Five most popular perennial vegetables are asparagus, rhubarb, jerusalem artichoke, globe artichoke and crosnes (chinese artichokes).