All you need is:
- some empty soda cans
- scissors that can cut trough the soda can
- water and a self made watering can ;-)
Step 1: Cutting the Soda Cans
Just cut the soda cans in two with a strong scissor.
Step 2: Arrange Soda Cans, Fill With Soil and Sow
Tip: remove the lid but push back the piece you pushed inwards while opening the soda can.
Fill with soil and sow whatever you want.
I've sown some sunflowers.