for my world i created JSON file for industrial hemp form Immersive enginering
give seed and industrial hemp string (50/50 probability)
so if you find it interesting, feel free to include it

currently instaled under resource/plants, my question: it is possible to have separate directory for custom created JSON files?

hemp_plant.json.txt

Yes, you can place JSON files under any directory in the config/agricraft/json/defaults directory.

Furthermore, if you place them in a folder named mod_<mod id> then AgriCraft will automatically skip the loading if a mod with that id is not present.