Ironwood Pines were massive pine trees found in the Deepwoods. Their wood was extremely heavy and strong, and kernels from within their massive pinecones were edible. They tended to grow in groups, like the Ironwood Stands .
Ironwood Pines grew in distinctive spurts. For perhaps fifty years, the trunks of the trees would expand and grow higher, and then the tree would spend the next few decades growing a ring of large branches. The cycle would then repeat itself. As a result, Ironwood Pines were colossal, straight trees with distinctive branch rings at regular intervals.
Although the tree does not bear fruit, a species of mushrooms may grow on it, as seen in Clash of the Sky Galleons.