Winter squash refers to several species of warm-season annual vegetables in the Cucurbitaceae family, primarily Cucurbita maxima, Cucurbita moschata, and Cucurbita pepo. Unlike summer squash, winter squash is harvested after the fruit reaches full maturity and the rind has hardened, allowing for long-term storage. Varieties include butternut, acorn, delicata, kabocha, and hubbard.
Winter squash has been cultivated in the Americas for over 10,000 years, making it one of the oldest domesticated crops. Indigenous peoples developed a wide range of varieties adapted to different climates and uses. Winter squash was a staple of the Three Sisters planting system alongside corn and beans.
Winter squash is roasted, baked, mashed, and used in soups. The flesh is a source of vitamin A (as beta-carotene), vitamin C, and fiber. The seeds are also edible. Winter squash stores well without refrigeration for 2 to 6 months depending on the variety.
Winter squash is harvested when the rind is hard enough to resist puncture and the stem begins to dry. The fruit is cut from the vine with a 5 to 10 centimeter (2 to 4 inch) stem attached. Squash is cured at 27 to 29 degrees Celsius (80 to 85 degrees Fahrenheit) for 10 to 14 days, then stored at 10 to 13 degrees Celsius (50 to 55 degrees Fahrenheit).
Winter squash requires a long, warm growing season. Plants are vigorous vines that spread extensively. Powdery mildew and squash vine borers are common. Crop rotation is essential to prevent soilborne diseases. Trellising is used to save space and improve air circulation.