I have been saving the end of this stack of what I think is back locust for 4 years. it finally fell over onto the adjacent stack so I decided it's finally time to burn it. Well, to be honest, my dad kept making fun of me for saving wood for so long! It made me sad to haul it up to the stack at the house for burning. Perhaps I will save a little bit in another stack somewhere...it's aging fine with no rot or bugs. I think it's around 6 years old now.