I have some tall Myrtillos (1 1/2 to 2 ft tall) that I've grown for some years. I've not noticed they become soft when not watered for a while. Actually, they seem stoic. Recently I used one of them for saving the top of a rotted cactus by grafting. It worked so well that I wanted more Myrtillos. I saw a couple pots of younger Myrtillos (3 per pot) at Home Depot and bought them. I put them in my greenhouse. This time of the year I keep the plants mostly dry, the temps might go from 35 F to 95 F. I use a small space heater to keep the plants above freezing and if I don't get out to the greenhouse to open it in the morning then the temperature can become quite high. My recently purchased younger Myrtillos have become a bit soft for some reason. My older Myrtillos aren't soft. I tried watering the younger ones but they haven't become firm again. The younger ones don't look like they are rotting but I have doubts. I'm not sure I should repot them at this point. They are still in the peaty mix they were in when I bought them. Does anyone have experience with this or have suggestions?