Right around the time I posted the 2014 review, I repotted my C. myrtifolia using a very deluxe brand of potting soil recommended by a nursery owner. Big mistake. The potting soil didn't drain well and the citrus tree developed root rot and started dying when it had 82 fruit on it. As the fruit and leaves dropped off over the course of a week, I managed to save a couple ripe fruit and planted the seeds. Some came true (citrus often helpfully clue you in to whether or not they've come true by producing two or more seedlings from a single seed). Other seeds from the same fruit yielded very different weedy-looking plants. My lesson: I now always make up a free-draining potting soil for my citrus. I typically start with a good grade potting soil (ProMix BX) and then add Turface (a baked clay product used on playing fields), and some fine pine bark mulch and/or chicken grit gravel. The ratio doesn't really matter that much as long as you use about 1 or 2 parts regular potting soil to 1 part comprised of the other ingredients.