The Giant Zombie will throw out small zombies after advancing a certain distance, so you need to bring pumpkin heads to the back row of plants to stop the small zombies from eating the plants. If the giant zombie invasion is too fierce to resist, you can put spikes on the ground, which can withstand the giant zombie's attack for a long time, and prolong the time for the back of the plant attack. If the giant zombie invasion is too fierce to resist, you can put spikes on the ground, which can withstand the giant zombie's attack for a long time, to extend the time for the next plant attack.