Dessert rose leaves keep dying

I have a dessert rose which occasionally grows a couple leaves but they quickly dry out and fall off. You can see the current leaf is having issues. I have the plant in very rocky soils and only water every few weeks. Any ideas??

I have a dessert rose which occasionally grows a couple leaves but they quickly dry out and fall off. You can see the current leaf is having issues. I have the plant in very rocky soils and only water every few weeks. Any ideas??