It is a very simple planter which doesn't occupy too much space, but at the same time it still provides enough soil for plants with deep roots.
Step 1: Material and Tools
You will need piece of sewer pipe, drill 8mm.
Step 2: Drill Some Holes to Bottom of the Pipe
Step 3: Check Stability
If needed the planter can be tide to some structure.
Step 4: Enjoy :-) Plant Something
In this case its an avocado plant from seed.
+ Due its form it can fit between other pots.
+ Multiple sewer planters might be stacked together