I noticed that when the inventory connected to the hopper pot is full, the pot is still simulating the growth (visually) even though there is no output due to lack of inventory space.. Could they be set to stop the growth cycle (to indicate the full inventory)?

I thought that it also be neat to make the hopper pot redstone dependent, so that one could use lever to stop it from making excessive resources.

Thanks for the suggestion. It sounds like the first part is a bug. I will look into fixing that. As for the redstone signal, that is a good idea and I will look into it.

Fixed the visual growing bug in 9dba80b and added redstone control in b40ade0.

You can find the release here