| Nominativ | castula | castule, castulae |
| Genitiv | castule, castulae, castulai | castularum, castulum |
| Dativ | castule, castulae, castulai | castulabus, castulis |
| Akkusativ | castulam | castulas |
| Ablativ | castula, castulad | castulabus, castulis |
| Vokativ | castula | castule, castulae |
