A cube is not something that can be grown, but instead a 3-Dimensional object that has equal angles equal lines on a 2-Dimensional Scale, and 6 total surfaces, and 24 angles, all of them right.
There is no secret ending.
watermanflowerstubebucketbowlspringsfireboneball
Grow CubeRegular Ending1. People 2. Water 3. Plants 4. Pot 5. Pipe 6. Fire 7. Dish 8. Bone 9. Ball 10. SpringThere Is No Secret Ending!
you download a program called cube version 1.42