R. 'Mrs Helen Koster'
Rhododendron Hybrid
| Hybridized By | Koster M. & Sons |
| Seed Parent | R. 'Mrs J J Crosfield' |
| Pollen Parent | R. catawbiense 'Catawbiense Grandiflorum' |
| Introduced | 1930 |
| 10 Year Height | 120 cm. (4ft.) |
| Bloom Time | late midseason |
| Flower | ? |
| Predominant Colour | ? |
| Leaves | ? |
| Winter Foliage | ? |
| Hardiness | H5 |
| Status | IRRC registered. |
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