Broccoli rabe has beautiful plants, but no flowers/florets.
Planted in late August for a fall crop and got beautiful growth, but no flowers or florets.....did I just get bad seeds?
Certified GKH Gardening Expert
Typically, you will want to harvest well before this happens. Once it flowers, it is ruined. After this point it should be considered inedible and thrown out.
This article will explain: https://www.gardeningknowhow.com/edible/vegetables/broccoli-rabe/broccoli-rabe.htm