Q. How long do wooden trunks last?

The longevity of a trunk box made of wood might range from 3 to 30 years. In 3 to 5 years untreated wood will rot if left outside. Redwood and cedar are two examples of rot-resistant woods that under perfect conditions can last 15-30 years. Cypress white oak teak mahogany and black locust are some other types of wood that fit this description. Even though pressure-treated wood has a 30- to 40-year lifespan I wouldn't use it because of the risk of exposure to hazardous chemicals used in the treatment. Especially if a user plans on growing veggies in the planter box this is not a good choice.