Ha! I spend half my night doing Google searches, it seems. We modern writers have it easy! Imagine doing any sort of research twenty+ years ago. You'd have to go to a library or interview someone.
I've done this. You ought to try and check out 10+ books on poisons. Old books, new books, colorful books, all about plant toxins and poisons. I was fairly young at the time and cheerfully told the librarian I was writing a short story. She was an older woman and simply sneered at me; the younger, male librarian at her side just smiled and said, 'Well, we'll keep our eye on you.'
Internet research is so much easier, but you must be careful as to accuracy and be wary of the sources you're using.
My most recent search involved rams and various historical religions/cults in which they have importance. Also round barns, and their rarity in New England, and the various types of mutism (hysterical, selective, etc.)