Celery is a lovely fresh stem vegetable. Leaves can also be used, as can the seeds. Used fresh or cooked in stews and soups.
I grew both the heritage “Nutty” celery that has a dense strong green stem and nutty flavour and a hollow, red stemmed variety called “Peppermint Stick”, these seeds are the result of self-seeded plants from those, so it could be either or, or a cross of the two. The self seeded plants that keep coming up in my garden are delicious and strong growing.