Why Red Cedar Naturally Resists Rot and Insects

Cedar has been a go-to choice for outdoor furniture for generations, and it's not just tradition keeping it there. Red cedar has real, built-in properties that make it genuinely well-suited to life outside, long before any stain or sealant gets involved. Here's what's actually going on inside the wood.

It Comes Down to Natural Oils

Red cedar contains natural oils and compounds, including thujaplicins, that most other softwoods simply don't have. These compounds are toxic to the fungi that cause wood rot and to many of the insects that damage other types of lumber, which means the wood is actively resistant to decay from the inside out rather than relying entirely on a surface treatment to do the work.

Why Insects Tend to Leave It Alone

Termites and other wood-boring insects generally avoid cedar because of the same natural compounds that repel fungal decay. That doesn't mean cedar is completely immune to every possible pest, but it's meaningfully more resistant than pine, fir, or other common softwoods that don't carry the same natural chemistry. It's a big part of why cedar has stayed a trusted choice for anything built to sit outside for years.

The Heartwood Matters

Not all parts of a cedar board offer the same level of protection. The heartwood, the denser inner wood of the tree, contains the highest concentration of these protective oils, while the lighter sapwood around the outer edge has less natural resistance. Quality cedar furniture, like the pieces in our All Things Cedar collection, is built with this in mind, which is part of what separates well-made cedar furniture from lower-grade lumber.

It Still Benefits From a Little Care

Cedar's natural resistance is a real advantage, but it isn't a substitute for any maintenance at all. Left unfinished, cedar will weather to a silvery gray over time, which some people love for the natural look. If you want to preserve the warm reddish-brown tone, an occasional sealant or stain helps block UV exposure, which fades color faster than it causes actual structural damage. Either way, cedar asks for far less upkeep than most people expect from real wood.

How It Compares to Treated Lumber

Pressure-treated lumber gets its rot resistance from chemicals added after the fact, while cedar's resistance is simply part of what the wood is. That's part of the appeal for people who want a natural material without synthetic treatments, along with the classic warmth and grain that only real wood provides.

A Material That's Earned Its Reputation

Cedar's popularity for outdoor furniture isn't just about looks. The natural oils that make it smell distinct are the same ones doing the work of keeping rot and insects away, which is why it's held up as a trusted outdoor material for so long. It's a case where the practical benefits and the appeal genuinely line up.