And I really mean "anything".
This mod was made for the PVEpLands server earlier this year, and I've gotten the express wish for it to be released as open source after some time of exclusive availability. I haven't heard too much about it, but you'll be able to use it to some hilarity (or serious purpose).
Key features:
Can plant, grow, and harvest almost anything in a pot like herbs and spices.
Freely configurable.
The model displayed is chosen by a seeded RNG from the existing ones, unfortunately there are no models for planted odd items.
Config can be reloaded without restarting the server.
Download: https://github.com/dmon82/MorePotables/releases
Not too much to spoil here so let's get to it. You can specify any item template ID in the config file, to be able to be potable. This can be iron longswords, copper lumps, or chicken eggs. Of course if you want to keep it sane, you can put tomatoes, woad, or mixed grass. Really almost anything seems to work.