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 | ? |
| Flower Color | ? |
| Fragrance | ? |
| Leaves | ? |
| Leaf persistence | ? |
| Minimum Hardiness | -15 C (5 F) |
| Additional Hardiness Info |
H5 |
| Registration | Registered |
