I have tried growing romanesco for the first time. My plants are gorgeous - huge and healthy. But NO romanesco. What is the trick?
Have you been fertilizing? It sounds as if there is too much nitrogen in the soil, which promotes lush, healthy growth but without enough phosphorus to balance it out, you will get little to no heads. You can try to offset the nitrogen by adding some phosphorus rich fertilizer or bone meal to the soil.
Here is more information on Romanesco care: https://www.gardeningknowhow.com/edible/vegetables/broccoli/growing-romanesco-broccoli.htm