The book they mention is "A Field Guide to the Native Edible Plants of New Zealand" by Andrew Crowe

His Māori pronunciation is very... white 😆, but an interesting video, thanks for posting!

I think the most interesting part for me was about tutu. Most of these plants you have to eat and you probably wouldn't, while with tutu they apparently taste sweet and he mentions a case in 2012 where some French tourists ate some and got very sick (also the earlier case of an elephant dying!).

But he briefly mentions that bees can bring the poison into honey, so you can get poisoned without even eating random bushes!

Did not know that kowhais were toxic - there you go -