Is celery a healthy food? Should I buy it organic?

Yes & Yes. Celery is a good source of vit c, vitamins b1, b2, b6, folic acid, calcium & potassium, it can lower blood pressure, help indigestion, reduce menopausal symptoms & may reduce risk of cancer & alzheimer's. See www.Foods-healing-power.Com/celery-health-benefits.Html however, it's listed #2 in the environmental working group's "dirty dozen" list of foods with most pesticides. See www.Ewg.Org/foodnews/.