Needing help creating 3D Plant growth system in 4.3

hiya! im a high school student who’s working on a school project and while I’ve worked in godot 2D for a while, im feeling a little out of my depth with 3D.

I need to create a plant growth system (much like that seen in stardew valley, or coral island) where the player places a seed in a planter, waters it and it grows over time with more watering, then the player can pick it up and the cycle repeats. I have a basic pick up/drop hotbar system set up, however im struggling to find any tutorials that help guide me in how im meant to approach the plant system. Any tips or guidance would be greatly appreciated, thank you 🫶🏻