Balloon Zombie

Balloon Zombies float gently over all of the player's plants and can only be targeted by Cacti and Cattail, or blown away by a Blover.

Strategy
Use a Cattail or a row of Cacti to pop their balloons, reducing them to the stats of normal zombies. If they are popped over a pool lane, they will die immediately as they will drop into the water and drown. Alternatively, one could blow all of them away with the Blover; the player should wait as long as possible before planting a Blover in order to save Sun. They cannot float over your Lawn Mowers, Pool Cleaners or Roof Cleaners, fortunately.

I, Zombie
The Balloon Zombie is only available in the Dead Zeppelin I, Zombie puzzle. Use them in rows without Cacti. The balloons will pop at the end of each row so that the Balloon Zombies can eat the brain, so sending them is not pointless. If you really want to send a Balloon Zombie in rows with Cacti, they can be removed by a Bungee Zombie.

Trivia

 * The Balloon Zombie, Zomboni, and Catapult Zombie is the only zombie capable of being killed in a single hit. If Balloon Zombie is over the pool when its balloon pops, it will immediately die. When it dies though, it just disappears. Zomboni and Catapult Zombie can be destroyed in one hit using spikeweed or spikerock.
 * Like the Bungee Zombie, Zombie Bobsled Team and Zombie Yeti, when the Balloon Zombie is hit by an explosive instant kill it does not crumble into ash but turns into a black silhouette and vanishes.
 * An inflating sound (ffff-wiissh) is heard before a Balloon Zombie appears to warn the player.
 * The Balloon Zombie and the Bungee Zombie are the only zombies to appear on both land and on the pool.
 * The Balloon Zombie and the Miner Zombie are the two zombies that only have one shoe, though arguably, the Snorkel Zombie also fits into this category. On the other hand, it technically has flippers, not shoes.
 * It´s unknown how the Balloon Zombie is able to move as there is never shown any kind of wind, and the Zombie doesn´t move.
 * An ordinary balloon cannot support a zombie.
 * The balloon Zombie is the only Zombie to be a Kid.
 * The balloon zombie, Bungee Zombie, Dolphin Rider Zombie and the Jack-in-the-Box Zombie are the only zombies that gives a signal that they are spawning.
 * It can also be killed by explosives like the jalapeno and the cob cannon.