Other than using the five elemental laws of the Five Leaf Grass, Mo Wuji had a second reason for grafting the Green Dew Rice plant on the Five Leaf Grass.
Mo Wuji was a top notch biologist on Earth, so he had an exceptional understanding of wild flora and fauna. Most wild fruit trees not only taste better after being transplanted a few times, but they also grow larger. This sort of grafting with a medium could be considered as transplanting from a certain perspective.
Moreover, ordinary rice also required one to first nurture the seedling to the point of sprouting before planting it in. While the Green Dew Rice required a different planting technique from normal rice, they were still rice. So who could say that nurturing the rice till it sprouted and grafting it on a medium wouldn't work?
