wow...I just planted HF young last spring....already she is up after being pruned to the ground this spring and she already has a few flower buds - she seems to be doing really well for me in zone 4 in Canada. Another one I planted last year was Blue Angel and she is already doing amazing well for a newbie in the garden!
I had a Dr Ruppel a few years back....she only flowered one flower for me in the three years she was in my garden (after that I dug her up)....I hope you have better luck with her - she is so pretty!