Freezing cauliflower is a great way to avoid waste, but it's best to cut it into smaller pieces before freezing to make it easier to manage.  If you have a fresh cauliflower, freeze it as soon as possible to preserve all nutrients. First, chop it into small florets, and blanch them (boil them for 1-2 minutes, and plunge them into ice-cold water). Once blanched, you can move florets into the freezer. It's good to freeze them individually on a baking tray before transferring them to a freezer bag to avoid them sticking together.