Mexican Oregano (Lippia graveolens) Substitute

If you don’t separate and develop your own individually source-able items, you are at the mercy and whim of any changes that sole supplier might make, not to mention that you lack control of the blend balance, pricing leverage, and have to deal with any ingredient or quality changes the upstream supplier might choose to make.  So in my view it is just a bad business practice not to separate the blends, and was probably done by the early 1960’s if not before. If it wasn’t done by then, certainly Brown would have made it happen a few years later.