Certified GKH Gardening Expert
Unlike many other crops, which bolt due to heat, celery will bolt prematurely if plants are exposed to too many days with temperatures below 55°F., especially if planted too early. Growing celery works best at daytime temperatures of 60° to 85°F.
Once a plant has fully bolted, the plant is normally inedible. It tends to be tough and woody, or even bitter tasting.