I have (or had) 4 Giant Sequoias on my property (Tamborine, QLD, Australia). It's a bit of a zone push, but nothing crazy here. It neither gets too hot or too cold in an average year, with the temperature range on an average year being 38c on the hottest day and -3c on the coldest night (extremes outside of this range can happen though). The rainfall is normally heavily summer-autumn biased. They've been here for about a year.

One of them died in summer after an unusually dry hot spell, and it looked like something had dug the soil away on one side, exposing the roots to the hot sun. The one in these pics was fine the whole time.

Things are cooling down now heading into our winter, and we've had quite a lot of rain, but we did have a dry spell (but not very hot), during which the lower branches on this one started to brown despite weekly waterings.…