My Desert Rose's leaves have been yellowing, then they drop. Here are some details that might be useful:

- I live in Zone 10, South Florida

- The soil seems hard -- I can get my finger into it only a little bit

- When I pull it out of the pot, the roots seem healthy/white (I am posting a picture of this)

These are my questions:

Is it normal for it to start dropping leaves/is it going into "rest"?

Is it ever OK for the soil to be hard?

If I need to repot, how much bigger does the pot need to be?

Is it OK to use Scott's soil for Cacti and Succulents or can I do my own mix? What should it be?

Thanks!