R. 'Cup Day'
Rhododendron Hybrid
| Hybridized By | Van de Ven K. |
| Seed Parent | R. 'Fusilier Group' |
| Pollen Parent | R. 'Albatross' |
| Introduced | 1964 |
| 10 Year Height | 120 cm. (4ft.) |
| Bloom Time | ? |
| Flower | funnel-shaped |
| Flower Color | ? |
| Fragrance | ? |
| Leaves | ? |
| Leaf persistence | ? |
| Minimum Hardiness | ? |
| Registration | Registered |