Within the National Plant Specification conifers are defined as trees or shrubs of the orders Coniferales or Taxales. The NPS provides further detail on the nomenclature of Conifers as follows:
- Age/Condition or times transplanted
- Overall height
- Root protection
- Size of container
- Other information
- Plant List
Each plant must be specified by giving its full BOTANICAL name. For full details of the specification terms used in naming plants see TREES.