Yeah, I have a balcony that's a plant kill zone (north facing high rise in Australia, so lots of sun, the odd 40 degree (100 farenheit) day, aircon outlet there

Yeah, I have a balcony that's a plant kill zone (north facing high rise in Australia, so lots of sun, the odd 40 degree (100 farenheit) day, aircon outlet there pushes it up much hotter still. Peace lilies have been surviving (not thriving, but surviving) there for 8 years now, but I've tried and killed rosemary three times now. I suspect overwatering is the cause. All of these in pots, btw, because balcony - suspect that the rosemary would be easier in the ground.