The best wood for planter boxes is black locust lumber. This wood is highly resistant to insects, temperature extremes and rot. Black locust may last for 20 years or more exposed to the elements with no chemical treatment.
Julie Fletcher has been writing professionally for more than four years and has been published in "WNY Family," "Baton Rouge Family," "Unique Magazine" and online at Familyresource.com and MomGadget.com. Fletcher attended Rowan Cabarrus Community College. Part of her health-care education was provided by training through Elderwood Skilled Nursing Facilities.