I know they're they're toxic to dogs and cats, but not for humans. My vet said that he found two varieties that were ok for reptiles, and others she didn't know about. The common bush varieties that people tend to grow aren't good for anyone's consumption (not to mention taste horrible imo!), but Crown Marigold, Garland and other cultivars are popular Asian foods. I personally like the stems sauteed in oil with sesame seeds. XD As for the flowers, the petals are the only edible part, the flower stamen and base are bitter. The petals have a nice peppery taste to them though.