Like other cruciferous vegetables overcooked collard greens will begin to emit the unpleasant sulfur smell associated with overcooking. (whfoods.org)
Broccoli, along with other cruciferous vegetables such as cabbage and Brussels sprouts, contains natural pesticides that protect from pests and other potentially harmful organisms. (mindbodygreen.com)
Raw broccoli and other cruciferous vegetables contain small amounts of these phytochemicals (though at much lower concentrations). (wellnessmama.com)