Here's a quote from my favorite herb book, "Herbs for Health and Healing" by Kathi Keville on Kidney Stones;
"In some Herb books, it is said that lemon juice reduces the size of kidney stones, but most herval remedies, including those based on lemon juice and hydrangea, do not actually dissolve stones. Instead, they help eliminate the stones and reduce or relieve the pain that occurs as they are eliminated. The larger the stone, the more uncomfortable this can be. Herbs that reduce infection, pain and spasms are cramp bark, goldenrod and joe-pye weed, aptly nick-named "gravel root" for its ability to get rid of stones.
Goldenrod has received official recognition in Germany for its effectiveness in getting rid of kidney stones......
Agrimony, horsetail, yarrow, shepherd's purse, Saint-John's-wort and nettles can also be used to reduce bleeding caused by kidney stones.
At least 75% of kidney stones are composed of calcium combined with phosphate or oxalic acid. Medical experts believe that these stones result from an accumulation of unused calcium, and lack of exercise is generally thought to be a factor. A study conducted in 1973 showed that cranberries help prevent stones in some people by reducing the excessive amounts of calcium commonly found in the urinary tract. There is some scientific evidence that this may also be true of rose hips, which have traditionally been used to ease various urinary tract infections. Since the calcium-phosphate stones are most common in alkaline urine, cranberries and other herbs that acidify urine also help prevent stones.
Levels of the enzyme urease, which contributes to kidney stones, are increased by bacteria and the alkaline urine they produce. Studies on Rosemary conducted Paraguay, where this herb is an important folk medicine, showed that it almost completely inhibits urease.
If you are prone to kidney stones, play it safe and avoid such foods as rhubarb, spinach, beet greens, sorrel, green tea and chocolate. All of these are rich in oxalic acid. If you do eat these foods, try not to eat foods high in calcium at the same time - this means that spinach and cheese souffle or chocolate milk are especially problematic.
Uric acid stones are found in urine that is too acidic. If you get this type of stone, eat cherries, strawberries, apple juice, asparagus and nettles to make your urine more alkaline. Also consider changing your diet. One thing that can cause overly acidic urine is an overabundance of protein. The herbs meadowsweet, sarsaparilla, joe-pye weed and plantain (which is widely used by the Chinese to treat kidney problems) help rid the kidneys of excess uric acid. This use for meadowsweet was acknowledged in a French medical journal in 1942.
KIDNEY STONE TEA:
2 tsp hydrangea root
1 tsp wild Yam root
1 tsp cramp bark
1 1/2 qt water
1 tsp joe-pye weed
1/2 tsp each of corn silk, plantain leaf, and yarrow root
-Add hydrangea, wild yam and cramp bark to water in a saucepan. Bring to a boil, then turn down heat and simmer for 15 minutes. Remove from heat, add other herbs, cover pan and steep for at least 20 minutes. Strain and keep refridgerated. Drink 3-4 cups daily. If bleeding occurs, add 30 drops shepherd's purse tincture to each cup of tea.
A tea is especially appropriate when treating a kidney infection because you should already be drinking plenty of water to keep kidneys flushed and help prevent the stones from forming. For convenience, you can also take this formula as a tincture; take 2-3 dropperfuls a day."
That was long but hopefully helpful!