Calcots- Forcing onions

I planted my calcots about September 5th. I bought a few bags of onions at the grocery store. I think its a good idea to use as nice and big ones as you can find. You cut the tops off and bury them in a trench about four inches deep. They will sprout in about 5 weeks, as they grow you keep backfilling dirt around them. In march they will start to grow and you will have the nicest green onions you have ever seen.