Debra, when we bought the bench it was untreated wood. I wanted a pop in the garden and went to our local lumber store for stain. The nice young fellow waiting on me questioned me twice if I really wanted him to mix it up before I convinced him that yes I did in fact want a deep purple stain. Silly guy, I love my purple bench!
Sharon, so far my knowledge is only what I've read -- you are light years ahead of me in practical knowledge thanks to your wonderful aunt.
Vic, sometimes I think it is wise to leave plants alone that don't (for whatever reason) want to grow for you. I live in prime rhododendron country and cannot grow a decent shrub to save my soul (azaleas do better for me). So, I just drive around in mid-spring and admire all of the rhodies that surround me. Sea holly is beautiful, but can sure pack a prick if you're not careful.