R. 'Joseph Haydn'
Evergreen Azalea Hybrid
| Hybridized By | Vuyk van Nes |
| Azalea group | Vuykiana |
| Seed Parent | R. mucronatum var mucronatum |
| Pollen Parent | R. 'J.C. van Tol' |
| Introduced | 1938 |
| 10 Year Height | ? |
| Bloom Time | ? |
| Flower | ? |
| Flower Color | ? |
| Fragrance | ? |
| Leaves | ? |
| Leaf persistence | ? |
| Plant Hardiness | ? |
| Flower Bud Hardiness |
? |
| Registration | Unknown or not recorded |