I have Sweet William that I grew from seed the first year I started seeds. It didn't bloom the first year and I'd completely forgotten about by the end of the summer. In the Spring, I had a "Hey, where did you come from?!?" moment when I dragged out the neglected planter full of what I'd assumed were weeds and found it blooming.

I divided it the next year and put it in the garden, where it just about triples in size every year. Imagine my surprise when I came across the original seed packet and found it listed as a biennial. :)

this just happened to me as well... first time!
should i be cutting back everything for next year?