R. 'Joan Marie'
Rhododendron Hybrid
| Hybridized By | Cowles, J.C.. Stow, MA (superintendent of Dexter Estate 1959-1967), USA, 1960 |
| Seed Parent | ? |
| Pollen Parent | ? |
| 10 Year Height | 200 cm. (7ft.) |
| Bloom Time | midseason |
| Flower | broadly funnel-shaped |
| Predominant Colour | ? |
| Leaves | elliptic |
| Winter Foliage | ? |
| Hardiness | H5 |
| Status | IRRC registered. |