About 1600 years ago, a group of refugees settled on a mucky swath of land that would one day be known as Venice. What followed is one of the greatest marvels of human engineering: a city built entirely on trees in water. Enter European alder (Alnus glutinosa), an ordinary tree with an...

Sorry, it’s a fir thing. The white fir (Abies concolor) is no simple tree. It’s a part of broader complex of trees. What does this mean for in the context of its taxonomy? Well… it’s complex. Completely Arbortrary is produced and hosted by Casey Clapp and Alex Crowson Support the pod and become...