Table 1.

ANSI Z60.1 container class standards by height and caliper. The standards are published in Imperial units; conversions to SI: 1 inch = 2.54 cm, 1 foot = 0.305 m.

Types 1 & 2 shade treesTypes 3 & 4 small, upright, and spreading treesShrub form and multi-stem treesContainer class (#)
Minimum plant size (height/caliper)Maximum plant size (height/caliper)Minimum plant size (height/caliper)Maximum plant size (height/caliper)Minimum plant size (height)Maximum plant size (height)
12 inch4 feet12 inches3 feetN/AN/A1
2 feet6 feet18 inches4 feetN/AN/A2
3 feet6 feet2½ feet6 feet/1 inch2 feet5 feet3
4 feet7 feet4 feet7 feet/1¼ inches3 feet6 feet5
5 feet8 feet/1¼ inch5 feet1½ inches4 feet7 feet7
6 feet1½ inch6 feet/¾ inch1¾ inches5 feet8 feet10
8 feet/¾ inch2 inches1 inch2 inches6 feet10 feet15
1 inch2½ inches1¼ inches2½ inches7 feet12 feet20
1¼ inches3 inches1½ inches3 inches8 feet14 feet25
1¾ inches3½ inches2 inches3½ inches10 feet16 feet45
2 inches4 inches2½ inches4 inches12 feet18 feet65
2½ inches5 inches3 inches5 inches14 feet20 feet95/100