Table 5. Winter injury observations and mid-winter hardiness levels (1992-93) for recently planted rose species, some of which were not included in the main evaluation.
Hardiness Rating: The hardiness rating is the lowest temperature at which 50 percent of the stem sections were uninjured. The designation “(I)” under the Fahrenheit and Celsius columns indicates that the canes were injured in the field prior to collection.
| Cultivar | Winter Injury | Hardiness Rating | |
| Fahrenheit | Celsius | ||
| R. acicularis | tip | –44 | –42 |
| R. agrestis | snow | –12 | –25 |
| R. albertii * | snow | (I) | (I) |
| R. albertii * | <1/2 | (I) | (I) |
| R. amblyotis | tip | –44 | –42 |
| R. arkansana | tip | –38 | –39 |
| R. beggariana * | <1/2 | –22 | –30 |
| R. beggariana * | <1/2 | (I) | (I) |
| R. beggariana * | <1/2 | (I) | (I) |
| R. blanda | tip | –33 | –36 |
| R. canina | snow | (I) | (I) |
| R. carolina | snow | (I) | (I) |
| R. carolina grandiflora | <1/2 | –33 | –36 |
| R. cinnamomea | none | –44 | –42 |
| R. corymbifera | snow | (I) | (I) |
| R. elliptica | <1/2 | (I) | (I) |
| R. foliosa | snow | (I) | (I) |
| R. glauca * | tip | –27 | –33 |
| R. glauca * | tip | –33 | –36 |
| R. helenae | snow | (I) | (I) |
| R. hissarica | snow | (I) | (I) |
| R. hugonis | <1/2 | –22 | –30 |
| R. jundzlii | >1/2 | (I) | (I) |
| R. kokanica | snow | (I) | (I) |
| R. laxa | none | –38 | –39 |
| R. macounii | tip | –27 | –33 |
| R. marrettii | snow | (I) | (I) |
| R. mollis | tip | –27 | –33 |
| R. multiflora | snow | (I) | (I) |
| R. nitida | tip | –38 | –39 |
| R. palustris | tip | –38 | –39 |
| R. pendulina | tip | –33 | –36 |
| R. pomifera | <1/2 | –22 | –30 |
| R. primula | tip | –27 | –33 |
| R. roxburghii | snow | (I) | (I) |
| R. rubiginosa | <1/2 | (I) | (I) |
| R. rugosa kamtchatica | none | –44 | –42 |
| R. sertata | <1/2 | –22 | –30 |
| R. setigera | tip | –27 | –33 |
| R. spinosissima altaica | none | –33 | –36 |
| R. virginiana | tip | –38 | –39 |
| R. wilmottiae | <1/2 | –22 | –30 |
| R. woodsii | none | –44 | –42 |
* Genetically different specimens of species were evaluated and are listed separately