| 1 | Newly planted; not established, but is expected to live a long time. |
| 2 | Established tree that is not of mature size, but is expected to live a long time. |
| 3 | Mature tree that is expected to live at least 15 years. |
| 4 | Mature tree that has such a severe limiting factor that death is expected within 15 years regardless of treatment. Treatment may be warranted to prolong tree life. |
| 5 | Mature tree that is dead or nearly dead and is considered hazardous. Immediate removal is recommended. |
| 6 | Newly planted, but has a severe limiting factor such that treatment may be needed to avoid premature death. |
| 7 | Established tree, not of mature size, that has a severe limiting factor and needs treatment to avoid premature death. |
| 8 | Mature tree that has a limiting factor which requires treatment to prolong life more than 15 years. |
| 9 | Mature tree that is so near death that treatment is not recommended and is considered a poor allocation of time and money. Immediate removal is recommended. |