TIL: You can save a lot of substrate by using Kratky's "Upside down pot"-method!

I feel a little bit dumb right now, because I bought almost 200 liters of LECA this year for my balcony, just to find out that half of that may have worked out just as well...

The video covers growing root vegetables (potatoes, ginger, etc.) in particular, because they seem to not grow that well in substrate-less techniques like the suspended pot method.
Substrate is expensive, and you can cut a lot of it out by just using a cache pot or whatever inside the actual pot, and they don't seem to mind at all about that!