depending on where you live.............late may or early june.................in NE PA we waited for the 1st moon in June then planted the plants. Tomorrow Aug 7, I will be harvesting the cauliflower. Be sure to cut those plants on an angle as you may get some babies grow off the stems...........so leave a long stem...............and when you pick them and put them in a 5 gallon bucket with col water and 1/2 cup salt........and any bugs will be running real fast off so I don't bring them inside until I have cleaned them or broccoli real well............