What is a good defense against the Octozombie?

The Octozombie is annoying and often prevents me from passing levels.

What are some good defenses or strategies against the Octozombie?

Tangle Kelp is the best answer.

Ghost Pepper is my second favorite option.

Later you will get the Banana Launcher which is effective if you have it planted already.

I always use the Cabbage-pult wth plant food as it deals heavy damage to the octopi the zombie throws at you, as well as the zombie itself.( a lvl 1 cabbage-pult's plant food can kill a regular zombie in 1 hit!)Potato mine/Primal potato mine can kill it the moment it steps on land, but they don't work in the sea.