The Waltham Butternut squash is prolific, easy to grow, sweet, and tasty. This favorite has wonderful storage capability and is now available in organic seeds. Sweet, fine-textured flesh. Definitely the top choice winter squash. Butternut Squash has a sweet, almost nutty taste that is similar to sweet potato. Waltham Butternut Squash has yellow skin and orange flesh. When ripe, it turns increasingly deep orange and becomes even sweeter and richer.