Where can I find all these plants & such?

I've checked on here, but I can't find any answers. Some of my spells want me to use dried patchouli, it took forver for essential oils but now I need dried? I have asked all the plant people around where I live as well as some herbalists but no one knows what it is or where to get it. How do I do this if half the plants I need, no one who works in plants knows what I'm talking about? I recently found arnica, dried. I never found the actual plant and the last person I asked wanted to know why I needed it. I don't like people asking me questions and then judging me. I'm here for plants, that's all you need to know. I don't know where to find Vervain, Cinquefoils, Wintergreen, Hyacinth, and Agrimonia. Does anyone know where I can go if my local plant people and herbalists don't have them? I don't want to check Amazon or anything but I might have to.