My simple assumption is: that there is about 82% lower gravity on the Minecraft Moon (1/6% in real life), I dont know how it effects in the game, but you jump 300% high, and the trees should grow 300% higher in theory too. In minecraft, one tree's average height is 7 block, so A simple tree grew on Moon should be 21blocks high. Before this suggestion, there weren't any Moon projects what planted trees on Moon, so I can not be sure in this value. The sure is that trees really grow higher in lower gravity. The same on Mars and other planets. ( lower trees in higher gravity like Jupiter) I hope you would like it.
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