M.K. Dorje Jr. wrote:
I also grow Purple-Sprouting Broccoli as a perennial. I just pinch off the flowers and bend the stems over so the plants can re-root along the stem. These guys can go for years like this without much care. Some of new ones survived the recent deep freeze without problems- these guys are tough! Plant them in a spot where they'll get afternoon shade in the summer and they'll do fine.