Dr. Dirr Tree Spotlight: Thuja occidentalis-Eastern Arborvitae

Dr. Dirr’s thoughts on the Eastern Arborvitae: Not quite sure why I never fully respected this soft-textured needle evergreen but an epiphany occurred during a

Read More

Dr. Dirr’s Tree Spotlight: Ulmus americana

Without equivocation, the American elm was the dominant street, shade and urban tree species in North America until the introduction of Dutch elm disease. Embedded

Read More

Dr. Dirr’s Tree Spotlight: Quercus bicolor

The North American deciduous forest is rich with oak diversity such as Quercus bicolor. Oaks are categorized as belonging to the White or Red /Black

Read More

Dr. Dirr’s Tree Spotlight: Metasequoia glyptostroboides

Dr. Dirr’s Tree Spotlight September 18th, 2017 The species, Metasequoia glyptostroboides, was considered extinct until rediscovered in the 1940s in China and reintroduced via the

Read More

Dr. Dirr’s Tree Spotlight: Aesculus flava

Dr. Dirr’s Tree Spotlight: August 28th, 2017 Such a great tree, reaching its zenith in the southern Appalachians, with trees 80 to 100’ in height.

Read More