In working with any form of medicinal plant, it is important that you work hard to become and expert your knowledge of local plants. Not on that, you should know the ingredients for each “remedy”, how to prepare the ingredients, how to administer them and how often. Some herbs have different uses so you must know if they are to be infused, demulsified or decocted along with what part of the plant to use for any particular ailment. (Bark, roots, berries, leaves, oil, etc.) You have to know when to harvest and used the plants for the best results. Some plants are considered poisonous, but can be used safely for certain conditions. You MUST know these safe ways to use those particular concoctions and it must be CERTAIN. You cannot guess or be careless, because mistakes can be fatal and second chances don’t always present themselves.