R. 'Direktor Siebert'
Rhododendron Hybrid
| Hybridized By | Koster, D.A. |
| Seed Parent | R. 'Charlie Waterer' |
| Pollen Parent | R. 'Pink Pearl' |
| Introduced | 1907 |
| 10 Year Height | ? |
| Bloom Time | ? |
| Flower | campanulate |
| Predominant Colour | ? |
| Leaves | ? |
| Winter Foliage | ? |
| Hardiness | ? |
| Status | IRRC registered. |