You almost had me E-mailing Ladybug! Then you mentioned heavy soil, and it occurred to me that that there is no perfect solution for different regions....even in pots. I've tried numerous potting mix, citrus/cactus mix, acid mix etc. and hate it when the one I like disappears from the market. I even broke down and tried MG moisture control, against my better judgement. I couldn't get weeds to grow in that pot! I did use a cactus mix for my Adenium, and so far, so good, but it's only been a month or so. We shall see...