Edals Native couch tends to burn pretty easily. I think it's due to the very fine leaf which holds little water so the heat hits it pretty hard. Yes it will recover quickly after watering but will continue to brown off badly the next hot day. I'm not sure how to keep it from doing that. Our lawns are a bit of a mixed bag and its interesting to see how the various grasses respond to the heat. The buffalo holds up well and seems to thrive in the hotter weather if kept watered. Kikuyu has popped up on the footpath in a number of spots amongst the couch and isolated buffalo patches are also present. The couch browns off quickly but the others remain green so the footpath is patchy. If you want a permanently green lawn regardless of heat, you probably need something other than couch.