R. 'Cumulus'
Rhododendron Hybrid
| Hybridized By | Delp Weldon E. |
| Seed Parent | R. 'Weldy' |
| Pollen Parent | R. 'Serendipity' |
| Introduced | 1979 |
| 10 Year Height | 120 cm. (4ft.) |
| Bloom Time | late |
| Flower | openly funnel-shaped |
| Predominant Colour | ? |
| Leaves | obtuse |
| Winter Foliage | ? |
| Hardiness | ? |
| Status | IRRC registered. |