How do you beat ninjas on Zombie farm?

I use all 5 mutations Dragon fruit, Fly trap, Lima beans, Cauliflour, Garlic and have and Zombies (12 x Zombilocks, 3 x Zombarian, 1 x Zombee) The Zombilocks are fast and can gang up on the enemy very quickly. The Zombarians are slow but can take alot of damage and also absord all the overhead objects being thrown onto the weaker zombies. I don't send the Zombee, he's used for fertilizing my farm. Using this combo I can easily beat the nijas. it also beats the rabbits. hint ( it goes zombarian, zombielocks, and zombee)