I once planted some past-their-best parsnips in the garden from the fridge. I figured they'd either grow or compost. They grew. They flowered.
Ants pollinated them. The plants were covered in columns of ants trooping up to the flowers and back down.
Eventually they produced seeds. So many seeds they tried to overrun the whole garden.
@KaraLG84 @Heliograph @Pineywoozle
I've planted a potato that was growing in the cupboard.
There are little potatoes growing where the parsnips once roamed.