Following the advice of all you good folk, my celery is all ready to go.
I've pricked the plants into modules and have gradually been hardening them off. (If basking in 20C+ can be called "hardening".
The site is ready, with plenty of rotted horse-manure dug into it. I've top-dressed with spent potting compost and watered with Nemaslug.
So - when can I plant it out? The packet implies (rather than states) that it needs much the same weather conditions & timings as things like tomatoes, beans & courgettes. So do I wait a couple of weeks, or can I plant some now?