What climate and season does celery need?

Celery is a cool season crop and needs a long, cool, even growing period to make good tender stalks, roughly 15 to 22 C. In the plains it is grown in winter, and hill areas suit it well over a longer cool season. It dislikes both heat, which makes it bolt and turn stringy and bitter, and water stress, since it needs steady moisture and rich soil to swell the stalks. It is slower to mature than many greens, so it occupies the land for a good while. Confirm exact sowing dates for your region with your KVK.