What's a good herbal remedy for kidney problems?

What kind of problem: There are many different types of kidney problems- inflammation, infections, stones etc., so which remedy is best depends on the nature of the problem. For example, cordyceps can help some types of kidney failure. Golden coin grass can help dissolve kidney stones. For info on general tonic herbs for the kidneys see http://www.Naturalnews.Com/027211_tea_green_herbs.Html.