A Gargantuar in the original Plants vs. Zombies has 3,000 hit points. It is one of the toughest ordinary zombies in the game and can survive a huge amount of sustained plant fire before finally falling.
The Gargantuar’s threat comes from more than its health. Rather than simply eating plants, it smashes them with its telephone-pole weapon, removing defensive plants and damaging the player’s setup quickly. After taking substantial damage, it throws an Imp Zombie forward, creating a second threat while the Gargantuar continues advancing.
Its visual damage stages are a useful clue to its endurance: the Gargantuar changes appearance after taking roughly 1,000 and 2,000 damage, then is defeated at 3,000 total damage. Players sometimes confuse this figure with stronger Gargantuar variants in later games, or with the separate damage values used by instant-kill plants. The 3,000 figure applies to the standard Gargantuar in the original game.