How does cedar resist rot and insects compared to eucalyptus?

Cedar and eucalyptus are both popular choices for outdoor applications due to their natural resistance to rot and insects. However, they differ significantly in how they achieve this resistance. Cedar contains natural oils and chemicals, such as thujaplicins, that make it highly resistant to decay and insect infestations. These compounds act as a natural preservative, deterring pests and preventing fungal growth. On the other hand, eucalyptus has a high density and natural oils that provide some resistance to insects, but it is generally less effective against rot compared to cedar. Eucalyptus requires more maintenance and often needs chemical treatments to enhance its durability. In summary, cedar offers superior natural protection against rot and insects, making it a preferred choice for long-lasting outdoor projects, while eucalyptus may require additional treatments to achieve similar results.