ZomBotany is the first mini-game, available as soon as the mode is unlocked. It features several Peashooter Zombies and Wall-nut Zombies, which have the same abilities as their corresponding plants. Defensive plants such as Wall-nuts and Tall-nuts are vital here, considering the Peashooter Zombie's ability is to damage plants from afar.
ZomBotany is a portmanteau of the words zombie and botany, hence, the zombies here are plant-zombie hybrids.
The Hypno-shroom has disappointingly incomplete effects on plant-zombie hybrids. Although hypnotized Peashooter Zombies do the about face and munch their normal brethren, they continue to fire peas towards the player's house (apparently from the back of their head) which continue to damage his or her plants. They also are not harmed by peas fired by normal Peashooter Zombies and so don't run interference for the player's plants. Unfortunately, these bugs are not fixed in updates. These errors are fixed on the iPhone version (however, hypnotized Jalapeno Zombies will still destroy the player's plants).