It is a good rule of thumb to go for Heartwood while shopping for wood. Heartwood, also known as duramen, is the dead center of a tree. Its cells typically include tannins or other chemicals that give it a dark color and, in certain cases, a fragrant scent. Here are some of the wood types that excel in resisting rot: Mahogany Mahogany's great density and hardness make it extremely resistant to water and insects. It is noted for its great strength, stability, and longevity and is one of the most resistant wood to rot. It has a delicate, visible grain that sometimes spirals. Colors can be anything from gray to brown to red to orange, or a mixture of all four. The majority of Mahogany wood used in the United States comes from three countries: Mexico, Honduras, and the Philippines. Teak Teak has been dubbed the "gold standard" in terms of decay resistance. It's also extremely long-lasting and termite-resistant. It is highly valued for its look and durability, but it is also fairly costly. Widely grown in Africa, Asia, and Latin America. It seems to be golden to medium brown in hue, with the color deepening over time. The grain is usually straight, though it can be wavy on occasion. Black Cherry This wood is native to Eastern North America and is known for its durability and resistance to rot. It is reasonably priced wood. It is pinkish brown when freshly cut and darkens to a medium reddish brown with time and exposure to light. Except for a few curled grain patterns, the grain is usually straight and easy to work with. It has a smooth, consistent texture.