No one has grown this geranium??

My only experience is that I ordered it once or twice, and never saw any growth.

same here. I planted it at least twice and it never 'took' much less bloomed. )(zone 6a

Maybe that's your answer, no one has ever grown one. :)

I grew it once upon a time (I used to have a "thing" about hardy geraniums :-)) but it was not much bang for the buck so I eventually got rid of it. As I recall, I just planted it like I would any other spring ephemeral, with later emerging perennials to take up the slack.

It is Mediterranean in origin so should grow well if other Med type plantings grow well for you - well drained soils, warm, dry summers and mild winters.