This is how we grow our Celery, we just cut the bottom off a celery and plant this in our organic hydroponics system or the ground.
Cutting the bottom off the Celery
Nothing wasted at our house waste goes to the girls for recycling
Bottom of celery planted into hydroponics system
My number one helper see even the kids can do it
One I planted during winter, at this size we start to eat them in salads, no need to let them get too big, i try to get a few going as the are great to eat at this size.
So try cutting off the bottom of your Celery and planting them into your garden