Which of the following is classified as a perennial crop?

Asparagus is classified as a perennial crop because it has a lifecycle that extends over multiple years. Perennial crops grow back each season from their established root system without needing to be replanted. In the case of asparagus, once it is planted, it can produce edible shoots for many years, typically for 15 years or more, which makes it a valuable perennial crop for growers.

In contrast, the other crops listed, such as wheat, barley, and sunflower, are annual crops. These plants complete their lifecycle within a single growing season—germinating, growing, maturing, and producing seeds—all before dying off at the end of the season. Annual crops need to be sown anew each year, unlike perennials, which can provide harvests for many seasons from their existing roots.