I've been on the worldbuilding StackExchange for a little while now and I have yet to see a specific line of questioning. How do I design and create flora for my world? As this particular question may get closed as too broad, I will narrow it down.
Are there any online resources (preferably free) that I can use to research medicinal plants and how to combine them into tinctures and salves?
salve means: a medicinal ointment for healing or relieving wounds and sores.
As I would to use the information to help create flora to populate my world.