I have never had any problems with the caterpillars eating ANY of the parsley, regardless of the 'year.' :)

Oh no, absolutely don't remove the 2nd year parsley. In the past female BSTs have loved to lay eggs on the flower heads.

I always grow a few Parlsey plants every year and it acts like a biennial for me, makes a clump of foliage the first year and if it survives the winter, flowers the 2nd year. Most do not make it over the first winter, as the crown rots out. I have one parsley plant that overwintered and is going to seed now.

Thanks, Terrene. That's good to know.