Which tree is the primary source of balsa wood?

Which tree is the primary source of balsa wood? The answer is Ochroma pyramidale, a fast-growing tropical tree native to the Americas. It is commonly called the balsa tree, and its exceptionally light wood has made it valuable for models, floats, insulation, and composite structures.

Balsa wood is light because its cells contain large air spaces and relatively thin walls. Despite its low density, the wood can have a useful strength-to-weight ratio, especially when it is dry and properly selected. The tree itself grows rapidly in warm, humid environments and may reach roughly 30 metres in height.

Ochroma pyramidale is native from southern Mexico through Central America and into northern South America. Commercial balsa plantations are especially associated with Ecuador, whose climate supports rapid growth and a major export industry. The word “balsa” comes from Spanish and means “raft,” reflecting the wood’s historic use in buoyant craft.

Balsa is sometimes confused with other lightweight woods, including paulownia or cottonwood. Those species can also be light, but they are not the principal botanical source of commercial balsa wood.