My husband calls this polk salad and it’s edible. It is actually a very good green vegetable, but it is supposedly toxic and has to be prepared a certain way to draw the toxins out before they can be eaten. So when these start coming in, we gather up the tender leaves and give them to our next door neighbor, Miss Mary, who then prepares it and cooks it. At the end, she give us a bowl full, our share of the polk salad. They are actually delicious, like a cross between spinach and collard greens.
They say that it is best to eat the greens in the spring. By the fall, when they’ve flowered and have berries, they say not to cook them then as the toxins are more concentrated.