Well, that is totally another matter than poems or fiction. Not a bad idea at all. BUT you cannot get a book published in English in that area. You would need an editor and a translator. There is also a very alive Finnish herbal medicine tradition. And that is what makes it interesting. What is same, what is different, what is new to Finns? Yes, your topic is interesting. But only if there is someting new, something that is not commonly known like cranberries for urinal problems, blueberries for eyesight, "piharatamo" for desinfecting and curing wounds...i just wrote something about traditional asian herbal medicine from natural fruits and berries, which i found out that finland has alot of these here.
But it would help immensely if you could get the attention of some people who are into that kind of things. For example there is a magazine called VOI HYVIN (Feel Well), published by A-lehdet. Your topic is what they are into. Check the magazine counter at the supermarket.