There is a Seeding Broccoli item in the game files that can be spawned in debug mode. Seeding Broccoli is non-obtainable and there is no mention of it in any changelog and likely just a remnant from the mod created by RJ merged with PZ in 2012.
Broccoli model when placed in the world.
Rotten broccoli model when placed in the world.
From items_food.txt (Project Zomboid directory/media/scripts/)