opt for a raised bed garden soil or mix in some compost with your seed starting medium and select a container that is big ...
If you are growing from bulbs, you should plant them 1 inch into the soil. Ensure the container is in a bright location so the green onions will get a minimum of 6 hours a day of sunlight.
As soon as young beans appear at the base of the plant it's time to 'pinch out ... Leave beans to completely dry and store in an air tight container. These can be sown next year or rehydrated ...