The Colossal Chestnut tree produces very large nuts as the name suggests. At only 11-15 nuts/lb, your harvest will add up quickly. Each year the Colossal Chestnut tree will continue to spread and could eventually reach 30-40 feet tall. The Colossal Chestnut requires pollination by a second chestnut tree and Nuts fully ripen in mid-September.The male flowers of the Colossal Chestnut Tree are long and slender and is about the size of a small plum. After the first harvest, it will be obvious how the Colossal chestnut got its name. One chestnut from the Colossal Chestnut is colossal indeed, one chestnut can fit in a bowl! The seedpods on Colossal chestnut trees appear unnaturally oversized before the nuts are fully ripe. TyTy Nursery will guarantee that your Colossal Chestnut tree will grow in USDA Zones 5-9. Colossal Chestnuts are great when roasted and fewer nuts are needed to fill you up, and the tree bears heavily and ripens in September.