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 trees | Types 3 & 4 small, upright, and spreading trees | Shrub form and multi-stem trees | Container 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 inch | 4 feet | 12 inches | 3 feet | N/A | N/A | 1 |
2 feet | 6 feet | 18 inches | 4 feet | N/A | N/A | 2 |
3 feet | 6 feet | 2½ feet | 6 feet/1 inch | 2 feet | 5 feet | 3 |
4 feet | 7 feet | 4 feet | 7 feet/1¼ inches | 3 feet | 6 feet | 5 |
5 feet | 8 feet/1¼ inch | 5 feet | 1½ inches | 4 feet | 7 feet | 7 |
6 feet | 1½ inch | 6 feet/¾ inch | 1¾ inches | 5 feet | 8 feet | 10 |
8 feet/¾ inch | 2 inches | 1 inch | 2 inches | 6 feet | 10 feet | 15 |
1 inch | 2½ inches | 1¼ inches | 2½ inches | 7 feet | 12 feet | 20 |
1¼ inches | 3 inches | 1½ inches | 3 inches | 8 feet | 14 feet | 25 |
1¾ inches | 3½ inches | 2 inches | 3½ inches | 10 feet | 16 feet | 45 |
2 inches | 4 inches | 2½ inches | 4 inches | 12 feet | 18 feet | 65 |
2½ inches | 5 inches | 3 inches | 5 inches | 14 feet | 20 feet | 95/100 |