Urban horticulture The study of stresses affecting city trees, gardens and landscapes.
USDA United States Department of Agriculture.
USNA United States National Arboretum.
This site contains information in many areas, primarily urban horticulture in mile- high Denver's semiarid climate. Access the information on this site by clicking the "Home" button below.
Roger Kjelgren, associate professor of urban horticulture at Utah State University in Logan, has found that on a summer day dark-bark mulches can reach temperatures of 140 to 150 degrees F--hotter than asphalt.
than those that are, but there are always variables and if a plant near your black walnut looks stressed, it's worth considering relocating it. For a list of juglone tolerant plants I'll refer you to the University of Wisconsin's Urban Horticulture ...
 See also: Plant, Horticulture, Insect, Growing
  
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