It seems that "Ball Cactus" anything (I don't have Ridge Ball yet) simply won't sell regardless of soil, water or fertilizer types or amounts. I've put them out, properly pruned, on steroids, and way long after everything else has sold they linger on in the nursery. (yes, the aging is arrested by 'pausing' before sending to the sales floor). To the trash they go! If you can't sell it for a buck at the Dollar Store what's the point except for cross-pollination? Thank goodness that the other 14 items on the bench share the cost effectiveness of the fertilization. Is this a bug or am I missing something?