The only difficulty here are the zombies with a slightly higher health than normal.
Mummy Zombie x3
Fighting Power: 349
First Strike: --
Attack: Deals damage to target.
Skill: The zombie uses his bandage whirlwind to attack, posing a threat to enemies in front of him.
Leader Skill: [Primary militantness high]
Follow the tutorial, drag the plants you need into the lawn and you should win without any troubles.