Hi! I gave this plugin a try last night and it's exactly what I needed. There was an incompatibility with VisuMZ's EventsMoveCore plugin when trying to plant a new crop but your plugin's code is clean and clear so I was able to make it compatible with just a few lines added to the sprite update function.
Unfortunately I couldn't get manual watering to work in the demo project or my own, not sure what the problem is there. Update: I didn't realize the watering can item isn't given to the player in the demo. Works now after I did that!