Dr. Dirr Tree Spotlight: Magnolia x soulangeana- saucer magnolia

The hope of spring is tethered to this species and the many cultivars. Difficult to imagine a garden, park, campus, golf course, city street, commercial

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Dr. Dirr’s Tree Spotlight: Liriodendron tulipifera (Tuliptree)

From the arborists’ point of view, the tuliptree has more than its share of liabilities including excessively fast growth, limb breakage, drought-induced premature leaf abscission,

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Dr. Dirr’s Tree Spotlight: Acer triflorum – Three-flower Maple

A beautiful maple, resoundingly/photogenically magnificent in shades of orange and red in autumn. Colors long persistent, from initiation to the crescendo, easily 3 to 4

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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

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Styrax japonicus-Japanese snowbell

Beyond redbuds, Cercis, dogwoods, Cornus, flowering crabapples, Malus, and magnolias, Magnolia, there are precious few genera which offer significant cultivar diversity. Within eastern redbud, ~35

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Dr. Dirr Spotlight: Pyrus calleryana- Callery pear and invasiveness

Touted as the biological savior for stressful environments since the introduction of ‘Bradford’ in January, 1960.  Profuse white flowers in spring, shining dark green summer

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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

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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

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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

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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.

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