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Ash tree species in North America are under mortal threat from the Emerald Ash Borer (EAB), now in 35 states and five Canadian provinces.
The purpose of these guidelines is to provide a consistent methodology for public garden staff to develop and categorize a list of cultivated taxa observed escaping from their locations of cultivation.
The Red List of US Oaks report details for the first time the distributions, population trends, and threats facing all 91 native oak species in the U.S.
Oaks are critical to the health and function of forest and shrubland habitats in the United States, but many native oaks are threatened with extinction in the wild.
Improving urban forests is one of the solutions to achieving several of the United Nations Sustainable Development Goals and making cities healthier and more livable for people.
This tree plan, not only comprises a history of trees that once stood in the Park and catalogues the trees currently standing, but also directs the succession and maintenance of the tree canopy that future generations of Park users will enjoy.
In 2012, more than two million acres of important sage-brush habitat burned in four Western States.
Growing degree days have been used widely for both agriculture and horticulture purposes since the 1950s to track temperature accumulation.
Soil moisture is a key factor in determining the annual progress of natural environments and human systems.
As was felt recently at the South Carolina Botanical Garden, extreme precipitation and flooding can be exceptionally devastating. Excess rains can wash away trails, compromise bridges, and harm many varieties of plants in public gardens.