[header] How to harvest celery [title] Wait 3-5 months after planting the celery to harvest it. [step] The growing period for celery is much longer than 3 months, but they're best when harvested immature. Wait for 3 months after transplanting, or 4 months after the seed was first started to harvest the stalks. 
[substeps] The longer the celery grows, the tougher it will become. However, the tougher the celery, the more nutritious it tends to be.