Watering Can

The Watering Can is the first item the player starts with in the Zen Garden. It allows the player to water plants one at a time so that they will grow and become happy. It can be used for an unlimited number of times, and you get it by picking it up from the last zombie on level 5-4, after which it will direct you to the Zen Garden. For $10,000, the player can upgrade it to the Golden Watering Can in order to water up to four plants at once. The water in the Watering Can apparently lasts forever, as there is never any need to refill it for some reasons. When you water a plant that wants to be watered, it drops a silver coin.

Trivia

 * On the DSiWare version, the Watering Can is replaced by Bacon.
 * It is unknown where the watering can is refilled, or if for some reason it doesn't need to.
 * Possibly it refills with Crazy Dave's Magic Taco.
 * It is also possible that in between uses, it is refilled using the hose visible on the ground.