|C. illinoinensis is a large native tree, reaching 70-100' tall, 40-75' wide, can reach 150' in height. It is the largest of the hickory group with a tall, uniform, symmetrical form, and an oval crown. Due to its long taproot it does not transplant well. Prefers deep, moist and well drained soil, found naturally along river basins. Pecans are a delicious nut, very important as a commercial crop in the south. Native from Iowa to Indiana south to Alabama, Texas and Mexico.Tasty edible nuts on shady, graceful tree with long and narrow foliage. Commonly known as a pecan tree it is also the Texas state tree. Needs well-drained, deep soil. In hot summer climates it requires occasional deep watering.