It also happens to have been one of my sister's favorites, 
and she had a nice clump of it planted near her kitchen door. 
When she passed away, I asked permission to get some of the seeds... and saved them. 
Many years later, after we moved back to PA... 
I planted the seeds next to our house. 
Suddenly, this year... they grew. 
It's been a full 10yrs since my sister passed away... and I think she was saying "hello..."