The Yaupon Holly is a small to medium-sized tree that is indigenous to the southeastern United States. The Yaupon Holly is the only species of holly that is native to the United States . The Yaupon Holly typically grows to a height of 15-20 feet and has dark green, glossy leaves. The tree produces small white flowers that are followed by red berries. The berries of the Yaupon Holly are toxic to humans but are beloved by birds. The Yaupon Holly is a hardy tree that can tolerate a wide range of soil conditions and is resistant to pests and disease. Being evergreen, it is also great for providing shelter for birds and other wildlife. Yaupon Holly Leaves and Berries Are yaupon holly berries poisonous to humans? The berries of the yaupon holly ( Ilex vomitoria ) are bright red and attractive, resembling edible fruits like currants or wild cherries. However, they are toxic to humans and pets and can cause nausea, vomiting, and diarrhea if eaten. Birds and squirrels can safely consume th...