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Bare root caliper, tree height and root spread
| Caliper (inches) | Average height range (feet) | Minimum root spread (inches) |
|---|---|---|
| .5 | 5-6 | 12 |
| .75 | 6-8 | 16 |
| 1 | 8-10 | 18 |
| 1.25 | 8-10 | 20 |
| 1.5 | 10-12 | 22 |
| 1.75 | 10-12 | 24 |
| 2 | 12-14 | 28 |
| 2.5 | 12-14 | 32 |
| 3 | 14-16 | 38 |
Source: American Standard for Nursery Stock, ANSI Z60.1 published by American Association of Nurserymen, Washington D.C.
