Celery can be kept in the fridge for 2-3 weeks by cutting the ends of the stems. If blanched, you can also store it in your freezer. To clean it, the leaves and the ends of the stems (which can be used for soups) must be removed, and then you can cut and rinse the ribs under running water. You can consume it raw or cooked in a pan, or in the oven at 200° for 30 minutes.