Walter Jeffries wrote:I would definitely not use poplar for building a cordwood house. Poplar rots very easily. It is a very open, light, airy wood.
I have Cordwood Building: The State of the Art by Rob Roy, wherein poplar is highly recommended as one of the best possible species for building cordwood structures, precisely because it is a "very open, light, airy wood." Proper building technique to avoid decay is essential, however (as it should be with any wood construction).