Waltham Butternut Squash Seeds (Winter Type) Heirloom Vegetable. An excellent squash, weighing on average 1.5-2.3 kg (3.5-5 lbs). Creamy-yellow coloured fruit has a small seed cavity and a bulbous end with solid, smooth skin and deep orange flesh. A large, vigorous growing vine and heavy producer. The already great taste will improve with storage.