Seconding u/theUnmutual6's recommendations, in addition to u/BlueSmoke95's suggestion to check out Ann Moura's work. I would like to recommend Ellen Dugan's Natural Witchery and her related domestic witchery books. Ellen is a certified Master Gardener and incorporates plants into much of her work.

Some of my favorite plant books!

Plant Science:

• Plant Physiology and Development (you can get away with the previous edition of this one!)
  
  
• Botany for Gardeners
  
  
• Essential Plant Pathology (do NOT get the first edition - the second edition is superior in almost every single way)
  
  
• American Horticultural Society Plant Propagation: The Fully Illustrated Plant-by-Plant Manual of Practical Techniques
  
  
  Foraging & Field Guides:
  
  
• A Field Guide to Edible Wild Plants: Eastern and central North America
  
  
• Edible Wild Plants: Wild Foods From Dirt To Plate
  
  
• The Forager's Harvest: A Guide to Identifying, Harvesting, and Preparing Edible Wild Plants
  
  Herbalism:
  
  
• Rosemary Gladstar's Medicinal Herbs: A Beginner's Guide: 33 Healing Herbs to Know, Grow, and Use (this is the first one I would recommend to novices)
  
  
• The Herbal Apothecary: 100 Medicinal Herbs and How to Use Them
  
  
• The Herbal Medicine Maker's Manual
  
  
• 300 Herbs: A Materia Medica
  
  
• Culpeper's Complete Herbal
  
  Ethnobotany:
  
  
• A Modern Herbal Vol I and Vol II (these could belong in the above section or here - I love love love these books. I think they are a must for any hedge witch or green witch!!)
  
  
• Folklore and Symbolism of Flowers, Plants and Trees
  
  
• Whispers from the Woods: The Lore & Magic of Trees
  
  
• Braiding Sweetgrass: Indigenous Wisdom, Scientific Knowledge and the Teachings of Plants
  
  I also encourage y'all to look into fungi as well. I work with both plants and fungi and I think they bring a fascinating and fulfilling aspect to my work. Plus, hunting for mushrooms is super fun! I can recommend field guide books for folks who are interested, they just tend to be very region-specific so I'm not going to list all of them here.
  
  For general fungus reading I recommend the following:
  
  
• Magical Mushrooms, Mischievous Molds
  
  
• The Fifth Kingdom
  
  
• Mycelium Running
  
  
• Radical Mycology: A Treatise on Seeing & Working with Fungi
  
  
• Mushrooms Demystified

https://www.amazon.com/Rosemary-Gladstars-Medicinal-Herbs-Beginners/dp/1612120059

I'm not sure if you have ever heard of Rosemary Gladstar (she's been an herbalist for 50years or so). She is not Wiccan but she teaches and writes books on herbal recipes, tinctures, syrups, remedies etc. She's famous for making things like "zoom balls" for energy/stress and "fire cider" for it's healing properties during cold/flu season. I have used several of her concoctions and can swear by them. She also teaches which herb to grow in your garden for healing and useful things.

Here's a link to my favorite recipe: https://youtu.be/JU8U0bDmXks

Here is a link to her best book (IMO) called 'Medicinal Herbs, A Beginners Guide.'
https://www.amazon.com/Rosemary-Gladstars-Medicinal-Herbs-Beginners/dp/1612120059/ref=la_B000APUXMK_1_1?s=books&ie=UTF8&qid=1504553457&sr=1-1

In your area keep an eye out for an event called "Stop the Bleed". It is a free event that teachings how to teat medical trauma. Other than that you can go to 2nd hand book shops and look for books related to prepping topics. Other cheap suggestions.

• LED Headlamp
  
  • you can find these as cheap as $7 but this is what I suggest
    
• LED Flashlight
  
  • you can find these cheaper but that is what I suggest
    
• Edible plant books for your area on amazon.
  
  • Usually around $10 to $20
    
• Medical herbs book
  
  • you can find more like this on amazon
    
• Ask your parents to start gardening with you or at least let you do it. Seeds are cheap.
  
• Make yourself a hobo stove. There are videos on youtube on how to do it.
  
• Candles.
  
  • Cheap stuff you can get at thrift stores and on clearance. You'll slowly learn what are good prices on them over time. Right after the holidays are the best time for these.
    
    I've run out of time. Let me know if you have any questions.

Okay so this isn't complete, and apparently my account is too young (or doesn't have enough karma?) to make a post to the subreddit :(

But here is the original post I constructed to submit:

Hello r/herbalism.

This book list was compiled by a good friend of mine who has been a practicing herbalist for a while now. I thought you might all enjoy this list; it's divided into different sections based on the particular area of study. My friend would also like me to inform you "If anyone should have difficulty locating these books, I've found a website, called bookfinder.com, to be most useful in acquiring these books for a fraction of the price from regular booksellers."

Beginner Herbalism, General

• Rosemary Gladstar's Medicinal Herbs: A Beginner's Guide: 33 Healing Herbs to Know, Grow, and Use
  
  
• Making Plant Medicine by Richo Cech
  
  
• Modern Herbal Dispensatory: A Medicine Making Guide
  
  
• Rosemary Gladstar's Herbal Recipes for Vibrant Health
  
  
• Herbal Antibiotics: Natural Alternatives for Treating Drug Resistant Bacteria by Stephen Buhner
  
  
• The Herbal Medicine-Maker's Handbook: A Home Manual by James Green
  
  
• Earthwise Herbal Vol I. and Earthwise Herbal Vol. II by Matthew Wood.
  
  
• The Practice of Traditional Western Herbalism: Basic Doctrine, Energetics, and Classification by Matthew Wood
  
  
  
• Rodale's 21st Century Herbal by Michael Balick
  
  
• The Desktop Guide to Herbal Medicine: The Ultimate Multidisciplinary Reference to the Amazing Realm of Healing Plants in a Quick-Study, One-Stop Guide by Brigitte Mars
  
  
  
• The Herbalist's Way: The Art and Practice of Healing with Plant Medicines by Nancy Phillips, Michael Phillips, and Rosemary Gladstar
  
  
  

  Advanced Herbalism
  

  
  

• Medical Herbalism: The Science Principles and Practices Of Herbal Medicine by David Hoffman
  
  
• Adaptogens: Herbs for Strength, Stamina, and Stress Relief by David Winston
  
  
• Edward E Shook's Elementary Treatise in Herbology and Advanced Treatise in Herbology - (In regards to the second, my friend has found a free PDF of the advanced treatise.)
  
  
• The School of Natural Healing: The Reference Volume on Natural Herbs for the Teacher, Student or Herbal Practitioner by John R. Christopher
  
  
• The Complete Herbal Tutor: A Structured Course to Achieve Professional Expertise by Anne McIntyre
  
  

  Pharmacognosy and Phytochemistry (Part of the Advanced Herbalism List)
  

  
  
  

• The Constituents of Medicinal Plants: An Introduction to the Chemistry and Therapeutics of Herbal Medicine by A. Pengally
  
  
• Phytochemistry and Pharmacy for Practitioners of Botanical Medicine by Eric Yarnell
  
  
• Herbal Constituents: Foundations of Phytochemistry by Lisa Ganora
  
  
  

  Medicinal Mycology
  

  
  

• The Fungal Pharmacy: The Complete Guide to Medicinal Mushrooms and Lichens of North America by Robert Rogers
  
  
• Growing Gourmet and Medicinal Mushrooms by Paul Stamets
  
  
  
  

Here's my advice:

There are some plants you can easily grow, that have well known and tested medicinal properties. St. John's wort, for example, is a sedative that's pretty safe. Comfrey leaves make a good poultice for bruises and other aches/pains, but I wouldn't ingest it or put any part of the plant on an open wound. Comfrey is such a valuable plant for its other properties, that I would absolutely recommend growing it under every fruit tree you have. Willow bark can give you salicylic acid, which is where aspirin comes from. I've not attempted it, and I understand that willow bark has some other compounds that aren't so beneficial, so do your research.

But really, what you need is a book on growing herbal medicines. You can seriously kill someone if you don't know what you're doing, so definitely read up. I like this one, but don't rely on just one source if you're really going to be serious about natural medicines.