Today I was playing Minecraft, and I was harvesting sugarcane. Then I thought: if I could place sugarcane on another sugarcane, how tall could it possibly get to? At first I thought it would be four blocks high, but it got higher. So I got into creative mode and discovered that it could be any height as long as it's in the Minecraft building limit. The image is the result of my experiment, no mod or texture pack, in Minecraft Java 1.19.3.