Tree Guides

USDA Plant Hardiness Zone Map

The 2012 USDA Plant Hardiness Zone Map helps tree planters and other growers and gardeners determine which plants are most likely to thrive in a particular location. The map is based on the average annual minimum winter temperature.  This interactive GIS-based map allows the viewer to “click” down in scale to one-half mile. It also includes national, state and regional images in a variety of resolutions, and a ZIP code finder that provides the plant hardiness zone for all U.S. ZIP codes.

Leafsnap: An Electronic Field Guide

Leafsnap is the first in a series of electronic field guides being developed by researchers from Columbia University, the University of Maryland, and the Smithsonian Institution. This free mobile app uses visual recognition software to help identify tree species from photographs of their leaves. Find out more and download the app.

ANSI Standards for the Professional Arborist

The Tree Care Industry Association has developed voluntary industry consensus standards based on current research and sound practices to manage trees, shrubs, and other woody plants.

The American National Standards Institute (ANSI) A300 Standards are divided into multiple parts, each focusing on an aspect of woody plant management.  Standards specifically address best management practices around pruning, soil management, lightening protection, transplanting, tree risk management, and integrated pest management.

Use these standards to develop written specifications for work assignments.  The standards also apply to professionals who provide for or supervise the management of trees, shrubs, and other woody landscape plants. Intended users include businesses, government agencies, property owners, property managers, and utilities.