I have other mints growing splendidly in containers, but this one has me baffled. I believe it is a mojito mint. I'm in the DFW area of Texas, and the container is on the east side of the house (morning sun, afternoon shade), planted in regular potting soil. I am considering moving it to a section of the yard with decomposed granite (where oregano and dill thrive) just in case it likes a loose soil. Any suggestions?