Inspecting a Garden Pot should also show growth percentage of whatever is inside it.
Right now there is no way to know if something has been planted 2 minutes ago or 2 days ago. No way to tell, either visual or numerical, how close to fully grown a plant is when in a garden pot.
Tar kilns show both quality of the kiln and percentage of the coal production. It would be nice to have something similar for garden pots.