Yellow perennial?

I bought this perinnial last year already in bloom...it looks like a small bush with lots of yellow or purple flowers all over it ( I don't remember which color it is cuz I bought both)...anyway, when it died off for winter, it looked like a bunch of dry sticks sticking out of the ground. This year, something did come back in it's place but it is a very tall green plant that is just growing straight up and is now taller than the rose bush next to it...so my question is a.) does anyone know what kind of perennial this is? and b.) if so, do I need cut it down and/or what other kind of maitenence does it require?

Yellow perennial?
take a cutting to the local nursery and ask for advice.
Reply:? lantana ? http://images.search.yahoo.com/search/im...
Reply:A picture would make it possible for me to answer.

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