R. 'Effective'
Azalea Hybrid
| Hybridized By | Morrison, B.Y. | Pass Christian, Mississippi | USA, 1947 |
| Azalea group | Glenn Dale |
| Seed Parent | R. 'Vittatum' |
| Pollen Parent | R. 'Osakazuki' |
| 10 Year Height | 120 cm. (4ft.) |
| Bloom Time | midseason |
| Flower | ? |
| Predominant Colour | ? |
| Leaves | ? |
| Winter Foliage | ? |
| Hardiness | ? |