This interesting member of the onion family is called Allium nectaroscortum siculum and was brought to my garden by chance. Like all the allium I have tried (I think I've got about 6 different varieties), it self seeds very easily. Chances are, the seed arrived in my garden in a potted perennial that is now long gone. It is growing in sandy soil in a shaded location under a PeeGee Hydrangea - and stands about a meter high. It's a quiet sort of plant that you have to look for - the blooms are a soft green/pink shade. From the one chance plant, I now have three.
You would find find this allium in early fall in a good nursery, or on-line from a bulb supplier. For something that's a little unusual that works in both sun and shade - it's another good plant.