Heads on Cauliflower
How long does it take to have heads on cauliflower after planting the plants?
Certified GKH Gardening Expert
I would begin looking for head formation within 30 days of planting, if not a little bit sooner. You should check periodically so that you can blanch the heads once they're big enough. This article will explain more: https://www.gardeningknowhow.com/edible/vegetables/cauliflower/blanching-cauliflower.htm