Balloon Zombie

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

Strategy
Use a Cattail or a row of Cacti to pop their balloons, reducing them to the state of a normal zombie. 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 by blowing away multiple. 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 Mode level. 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. Note that Balloon Zombies will not eat Sunflowers that they fly over.

Trivia

 * The Balloon Zombie, the Zomboni, and the Catapult Zombie are the only zombies that can be killed using a single hit from a plant (except for instant kills).
 * If a Balloon Zombie is over the pool when its balloon pops, it will immediately die, disappearing instantly.
 * The Zomboni and the Catapult Zombie can be destroyed in one hit using a Spikeweed or a Spikerock.
 * Like the Bungee Zombie, Zombie Bobsled Team and Zombie Yeti, when a Balloon Zombie with a balloon is hit by an explosive instant kill it does not crumble into ash but turns into a black silhouette and vanishes.
 * An inflating sound is heard before Balloon Zombies appear.
 * The Balloon Zombie and the Bungee Zombie are the only zombies to appear both on land and in the pool.
 * The Balloon Zombie, Bungee Zombie, Dolphin Rider Zombie, Zomboni, Jack-in-the-Box Zombie, and Pogo Zombie are the only zombies that make noises before exploding.
 * The Balloon Zombie is one of the only two zombies that is supposed to be a kid. The other is the Imp
 * The Balloon Zombie can be killed by explosives while in the air.
 * If a Balloon Zombie is hit by a lawn mower while still on its balloon, it's balloon will pop and it will turn into smoke (like a Gargantuar).
 * The Balloon Zombie can be frozen while still floating if an Ice-shroom is used, but it will only be slowed.
 * The Balloon Zombie (while on its balloon), the Digger Zombie, (while digging), the Ladder Zombie, the Gargantuar, the Zomboni, and the Catapult Zombie are the only zombies that can get past a Tall-nut by themselves.
 * The Balloon Zombie is the only non-Vault Zombie that can pass every type of plant without trying to eat it.