I think any bulb whose pod is fully formed, even though entirely green, is worth a try. At worst, you'll have nothing germinate, but at best, you may get some or plenty. You're no worse off whatever you do. In my experience though, once the pod is picked, it shouldn't be allowed to dry out or the unripe seeds will shrivel. As Anne says, put the stems in a glass of water or with Galanthus whose stems may be lax, just put the pods in a sauce with damp paper, the stem end down if possible. And don't put them on a sunny windowsill, but in a light, airy place out of direct sunlight.
