I have a large planted lemon tree in my back yard.  It was a Meyer Lemon grafted onto a wild bitter lemon...over the years the bitter took over the Meyer, and the tree’s fruit grew large, but very bitter tasting.  I began applying Retrosance microbes to the soil. The first season the fruit were more plentiful, but still bitter.  We liked the tree anyway for ornamentation.  In the second season of Retrosance treatment the fruit became usable, & much of the bitterness was mitigated.  By season three we have a large wild lemon tree with fruit that make excellent lemonade.  I know Retrosance products helped make this happen.