I started my celery about 3 weeks ago. I believe that you could get some celery this year. May not be a blue ribbon winner but hey how much are you spending 50 cents? I say go for it. I started mine in cardboard egg cartons and they are outside in a sun protected cold frame. I hope to be able to transplant late next week.

You may want to direct seed at this point. I did that years ago and had more celery than we could use out of a smallish 3 foot square.

celery root is probably celeriac (i grew it lst year)..i wasn't impressed. Celery can be started now..i'd go for it. I've grown it a few years now. The number one things...WATER it! Don't let it get dry. I had some last year that dried out and was terrible.

Absolutely! Even if it doesn't achieve full fat celery like in the supermarket size--it's totally useful almost daily! Use it when thin as a light seasoning, in dps, in tuna salad (and similar), soups, even cold ones!--

I think it's GREAT to have a few celery plants--I do try to water them a bit extra if it's extra dry. But--I mulch REALLY deeply, so it's seldom an issue.

Good luck!

Paula