Row, Row, Row Your Boat

This is a minigame set in the pool. Most zombies that come are Canoe Zombies. Given that those are aquatic zombies, that means that you should line the pool with defensive plants and make the lawn your main offense area with Gloom-shrooms and Garlics. There are three flags and the time before the zombies come is 90 seconds, because it might be rather hard, and you need time to set up pool defenses.

Common
Canoe Zombie

Every Flag
Flag Zombie

Zombie

Ducky Tube Zombie

Conehead Zombie

Very Rare
Zombie Yeti and its variants

Snorkel Zombie

Football Zombie

Trivia

 * Its name comes from the song "Row, row, row your boat"
 * This name is from the fact that the level is full of Canoe Zombies.
 * Even though most zombies are in the pool, land zombies come very rarely and every flag.