Asthma Herbs...?

I have very bad asthma. I know how to reduce my symptoms down to almost nothing through clean eating raw foods daily, lots of exercise and sunshine, and avoiding triggers. However, even when I was at my peak in performance, I could still have a sudden attack, they just happen a lot less frequently. (Also usually a lot worse too)

Are there herbs I could use, if I had no way to obtain medicine, beside ephedra. I was using ephedra almost exclusively for control. I still intend to grow some for medicinal use, but it really isn't the best on my heart. I understand tea is helpful, but I know for me personally, it's help is really limited. Am I missing something else?