It can be bought in a store, but doesn't have to be.
It is not used outdoors.
It is not hung on a tree.
It is not normally consumed by humans.
It is something that is grown.
It can be argued that it is displayed as a decoration.
It is neither red nor green.
It is not normally hung on a wall or ceiling.
It is usually bigger than a loaf of bread.
It is not grown in the ground.
It is generally brown in color.
It is commonly referred to by just one name.
It is not placed on a table when in use.