NYSSA SYLVATICA 'BBN-01' NITRO BLACK GUM, In the spring the first leaves of this tree emerge a brilliant fire red; in summer the leaves transition to a deeper green. In fall, the leaves change from green/orange quickly to red with mottled darker red splotches that make it deeper in color. What differentiates the Nitro from the popular 'Wildfire' is that it grows more vigorously with larger leaves and more growth in less time than wildfire. Nitro matures at approximately 50 feet tall with a 25-30 foot spread. Zone 4-9