Heat for sure Arron, gets rather cold here as it is now.
My new house where these are is all Opal, Laserlite. It was finished & plants put in this summer, temps got to 38c. I didn't put any shade on, no burn except where I had an end wall vent put in. The plants have responded beyond belief, flowers everywhere & way out of normal times I used to flower them in, like 6 - 7 months different. This old house & hopefully this new one I want to hold at Min 10c. Depending if Frost & intensity, they may get down to 6c but haven't had any damage with that. Summer, any temp of, I have large evaporative coolers running. Can still get to 40c but humidity at 80%+, again no damage. I do hand mist spray during the day.
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