Let’s play the ‘I’m thinking of something’ riddle game.
The following hints lead to our latest mystery word. (This riddle is more difficult than the previous two riddles.)
Some plants have them; others do not.
Some grow wild; others grow under cultivation.
One definition of the mystery word:
any plant that stores its complete life cycle in an underground storage structure
They grow in layers.
People often call the edible ones "root vegetables".