Place a medium sized pot of water on a burner and bring to a boil
While you're waiting for the water to boil, prepare your celery. Separate and wash each individual stalk of celery.
Chop the celery into 1 inch pieces.
Once your pot of water is at a rolling boil, place your chopped celery into the water and set a timer for 3 minutes.
While the celery is boiling prepare an ice bath by placing a couple of handfuls of ice in a bowl and adding about 2 cups of water.
Once your timer goes off, strain the celery and place it into your prepared ice bath to stop the celery from cooking further. Stir them around a bit to speed up the cooling process.
remove the celery pieces from the ice bath and set them out to dry on a dry towel.
Once the celery is dry, place it in a labeled freezer bag. Don't forget to write "Celery" and the date on your freezer bag.
I believe that the frozen celery is good for up to a year, but ours has never lasted this long.
Recipe by Green Leaves and Jam, a Plant-Based Diet at http://greenleavesandjam.com/how-to-blanch-and-freeze-celery/