Waltham Butternut Organic Squash Seeds 4182 Heirloom Vegetable. An excellent winter 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. Butternut’s already great taste will only improve with storage!