Plants are living organisms that belong to the Plantae kingdom. They obtain most of their energy from sunlight in a process called photosynthesis. However, not all plants absorb energy via photosynthesis. They are the protagonists of Plants vs. Zombies 2 and the player's main defense against the undead assailants.
As of the 11.0.1 update, there is a grand total of 190 plants, 120 of which are premium plants and among the premium plants, 22 of them cost real money, 13 of them cost gems. Out of the remaining plants, 72 can be unlocked with seed packets, 13 can be unlocked with mints, and one of them is only available via Zen Garden.