[Dudoight]

I have some wild willows...are they okay (not weeping)? I even have a small mimosa.

[teenyelliott]

White willows are the ones commonly used to make medicine. However, all willows will contain salicin. Do some research and make sure the trees you have are safe to use. If there is a known allergy to aspirin, the same would apply to using salicin.

All tree bark contains tannins, which are good to use in a pinch. Even the US military manuals teach soldiers to use tree bark when injured.

Cattails are also a good source for medicinal and food uses, and are very common.

Don't listen to me though. Do your own research, and you will be amazed at all the things around you that are useful.