One of the most gratifying things I've done in the garden was grow a potato tower. The first time I used a variety which doesn't root out very well from stems, so the results were really disappointing. A few years later I figured out my mistake and tried with a more suitable variety, and it was like a vertical potato farm in a 1.5m radius. We were so excited with how many potatoes came out, haha. I never expected knocking down a pile of soil and discovering potatoes to be so exhilarating. Especially after the first run was such a disappointment