Place the powdered jewelweed and plantain in a bowl and combine them by stirring in only enough lukewarm water to mix them together thoroughly.
Cover the bowl loosely with wax paper or a clean dish towel, and place it in the refrigerator to settle and chill overnight.
Strain away the plant matter and keep the greenish brown juice in a clean bowl.
Add in all of the other soap ingredients, and stir to combine thoroughly.
Mix in the soap base and process by following the ingredients on the package.