Originally posted by jonnin:

this is on the unmodded game?
Its a bug, if its below the ground and unpickable. If you have mods, I would be very quick to point a finger, because this has never happened to me over a lot of time, lots of farms at my bases, and lots of plants. Not even once.

I play pure walheim.

I have no idea what's wrong with my onion, but it clearly doesn't like being in my garden.