The heads, stalks and leaves are all edible, and have a mild flavour. The stalks taste a bit like asparagus.
White Sprouting Broccoli sets heads later than Purple Sprouting Broccoli, and doesn’t bolt as quickly in heat. In a garden, you can treat it as a cut and come again vegetable if you harvest the stalks before the flowers open.
Leave large leaves on plant as a shelter for the next round of young shoots that will sprout.