AnWan
HE is given UP all curse energy that he can feed to Nero or enhance his inheritance/constitution for a peanut. The author is portraying MC as dumber at each passing chapter.
Brother this is not nutty Cultivation novel where he has to do and be the one, here the whole humanity is at stake, he is basically trying to raise the level of human healers as a whole, something that will be much more emergence than just him knowing how to do something and others nothing, especially when he is not even a king, or prince or duke even, this will bring down casualties and increase the no of good fighters.
First off he should add some type of poison to his vines so it knocks his patients out, to stop them from screaming and suffering unnecessarily. Of course said poison would also help immensely in combat. Second, it might be a good idea to find a rule that would act as some type of container around the rose bud that closes around it when it blooms. So he doesn't need somebody else to package the cursed roses for him, meaning Ashlynn can just pick the containers up into a space ring. I am assuming the vines are just Nero's mold ability and not the MC learning a law of wood or plants. It makes me wonder, does Nero's ability give the MC access to whatever element he wants as long as he knows enough to simulate it. However, you could say that MC's Sun and healing law would definitely help plants and Ashlynn has a very high affinity towards plants as well. So the vines might not have anything to do with Nero at all and are just the MC's understanding of those two laws.