Gather your supplies. Important that your spring onions have roots. You can use anything to plant into, even just one large pot.
Cut the bottoms off your spring onions, a few centimetres from the roots.
Get your containers ready. I used toilet rolls cut in half and folded - I learnt this from someone else's guide!
Fill half your container with soil, hold spring onions in place with roots as low as possible and fill remaining space with soil.
Add a little water. Keep soil damp. Sit containers in a larger container on a windowsill or similar.
Within a few days you will see new green regrowth. When you harvest your spring onions cut off what you need and leave the roots in the soil - it will keep growing back!
Here they are after a week or so. Plant them in a larger pot or garden bed whenever you like!