Kentucky coffeetree was indeed used as a coffee substitute. The large beens were also eaten roasted or ground up and mixed with other ingedients. The root bark was used medicinaly, mostly as a laxative. It also produces black dye. The heavy but soft wood is very durable in contact with the ground, and was used more for fencing than otherwise. The leaves are close to two feet long, but twice compound, so they don't appear that large.