That's how mine behaved. The first year from seed it grew a rosette. The second year it flowered, set seed, and later died. I know it should be perennial but, I guess, conditions aren't ideal for it here.
Okay, just had a thought and had to look up some info. Guess who I got my original seeds from almost 10 years ago?
YOU, Joseph!
They should be hardy for you outside since they are rated to zone 6.
I recall that the leaves smelled like lemon-lime soda. Do they smell like that to you?