Skandi Rogers wrote: And Kim. I have photos from Scotland of roe deer loving montbretia flowers they ate the entire lot!
That's fascinating, Skandi! On the west coast of the US, the deer and elk don't seem to like them at all. They are such a reliable landscape plant. It's one of those plants that has become so plentiful in people's gardens that some call it invasive. I would say it is highly vigorous.
Regarding Asarum species and toxicity, in traditional American herbal medicine and herb use for flavoring Asarum canadense and Asarum caudatum rhizomes are used internally. Some people do react to parts of the plant, though. I think this may be a bit like elderberry, where some people can eat all the colors, others only the dark purple variety, others can't eat the red (I've become dramatically nauseated from eating a couple berries) but can the blue, and some can't eat any. It may also be where the plant is grown.
Here is a very interesting article by an herbalist from Minnesota. She talks about the wild ginger controversy in depth:
Minnesota Herbalist wild ginger article
And another article, this time from wild harvester Hank Shaw who also goes into it:
Honest-Food article about wild ginger
And this is the Green Deane article about it. In the comments at the bottom, some people reported being made quite sick from eating the leaves. That's not the part I was taught to use (only the rhizome/roots), nor the way they used it (they ate leaves in a salad), which may be one of the issues they had. The other person made a strong tea, but didn't say what part he used. Some people just might also be more sensitive than others, though:
Eat the Weeds article on using wild ginger
I post this because the plant does have really good herbal uses internally. But it's definitely an herb to be careful with.