Share 'Tip of the day: don't discard your celery head'

I read about this tip and gave it a try the other day.  With a large shop bought celery , I kept its stalk head with few lime green leaves.  Put it in a glass with fresh water on the windowsill.  After a few days the leaves become darker green and some roots start to form.    I then cut the head into 4 parts, pot it up with seeding compost.  They are now growing away as 4 individual celery plants…