Cauliflower

My cauliflower plants have grown big recently... at the same time, vegetable worms (those little green worms) are appearing every day!! Sigh... wonder where they appear from! One of my brinjal plants has grown so big that it is partially covering one of the cauliflower.... Strangely, the cauliflower plants look very much like my neighbour's kai lans! I hope it is not a mix up of the seeds!! LOL