I have a small verandha that is screened to keep cats completely contained. I am trying to put in small pots (which is not easy with curious cats of course). However, I find they can dehydrate quite fast. I use those saucers to catch water and which the pots sit in. They are very much sheltered from rain but I would have thought the shading from the screens would also decrease water loss. I go away for two days at a time and when I return the plants don't look too good. Outside in the garden, I rarely have problems with small pot plants. I wonder if it is the potting mix. The ones in the garden nearly always have garden soil. Or could it be the low humidity?