| Family: | Hydrangeaceae (hy-drain-jee-AY-see-ee) (Info) |
| Genus: | Hydrangea (hy-DRAIN-juh) (Info) |
| Species: | macrophylla (mak-roh-FIL-uh) (Info) |
| Cultivar: | Shamrock |
| Additional cultivar information: | (PP16223) |
| Hybridized | by Mallet |
| Registered or introduced: | 2004 |