Arizona Envirothon 2015

Urban/Community Forestry

Tree City, USA

AZ Envirothon
Photos and issues. Click on photos to see high-res versions.

Sweetgum (non native), long-lived but slow-growing, tall, with high branches that tangle with utilities, shade in summer, leaf fall in autumn, barren in winter, messy seeds pods.

Southern Magnolia (non-native), evergreen, short, long-lived but slow-growing, roots break up sidewalks.

Canary Island pines (non-native), lining both sides of a street, very aesthetic, great shade, long-lived but slow-growing, falling branch hazard for parked cars, constant maintenance needed.

More Canary Island pine (non-native), lining both sides of a street, very aesthetic, great shade, long-lived but slow-growing, falling branch hazard for parked cars, constant maintenance needed.

Elm (non-native), tall, with high branches that tangle with utilities, shade in summer, leaf fall in autumn, barren in winter, falling branch hazard.

These elms require constant maintenance that only the city can provide, expensive and slow, but a jobs program also.

City park pines (non-native), evergreen, long-lived and fast-growing, constant falling branch hazard.

Sycamores (non-native), tall, with high branches that tangle with utilities, shade in summer, leaf fall in autumn, barren in winter, falling branch hazard, messy seeds when they fall.

Multi-use city park, with unorganized open space (left), baseball diamonds (center), and a golf course (right), all with pines mixed in.

More city park land, with a golf course (left) and a wildland nature center (right), each serving different urban forest needs and stakeholders.




Laboratory of Tree-Ring Research, University of Arizona
Tucson, Arizona 85721 USA
Main Office: (520) 621-1608, Fax: (520) 621-8229
Comments to Paul Sheppard: sheppard @ ltrr.arizona.edu