They say that if you have parsley growing in the garden then you will always have parsley.
That is, they drop seed and you have many new plants each season. Yes, they do die back towards winter; so you need to renew.
Now is the time to plant parsley seed.
Collect seeds from the old plants or get some from a friend.
They do grow better from seed and dislike being transplanted.
Plant the seeds around the garden; you can't have too much.
I have both the finer curly leaf and broad leaf Italian varieties.
The fine leaf curly type is more versatile; ideal for making tabouli.