Half-hardy Perennials

Hi,
I am looking for ideas for half hardy perennials that you wouldn't be without in your gardens.   Plants that are worth the effort even though you may have to replace them year to year despite your attempts to overwinter.  Could you please give me the reason the plant is worth the effort i.e. growth habit, bloom time, length of bloom season, color etc.  Please post the plant name, hardiness zone (if known), your hardiness zone and state.   I am looking for any and all ideas.  I am located in zone 5 but I would like to see input from all zones. 
I hope the the results of this will be interesting for all to see. 
Thanks,
Jerry
Zone 5
W. MA  
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