Do you take need to take the leaves and tie them together so the head is covered? If so, when do you tie them up?
Growing Broccoli and Cauliflower in Arkansas
Certified GKH Gardening Expert
You can try placing the entire head in pantyhose or other suitable nylon stocking until ready for harvesting.
Here is an article or two that you may find helpful: https://www.gardeningknowhow.com/edible/vegetables/broccoli/how-to-grow-broccoli.htm