I'll chime in for raw honey even though it's not a plant. About 12-15 years ago I started getting pain in my right shoulder. This went on for about 6 months. My wife and friends and my doctor told me it was "bursitis" and I'd need an operation to get rid of it. Back then going to the doctor was the leading cause of avoidable death so I wasn't keen on getting that operation (it's now the 3rd leading cause of avoidable death).

I was whining about it one day to a friend of mine who was in his 70s and had been a pilot for the military and flew missions all over the world. He learned on lot doing that. He told me "Raw honey will cure that if you take a tablespoon every day for a few weeks" and explained it was actually an infection that the honey would kill.

He was right. I bought some honey from a local bee keeper and it was exactly two weeks later that the pain was entirely gone. Right about that time a neighbor of mine stopped by and mentioned he was going to the hospital for an operation for the same thing in two weeks. I told him about the honey and he got some from the same bee keeper and it cured him too.

Most doctors won't tell you raw honey will cure that. Most probably don't even know it will.