C maxima being one of my favorite species...I grow several varieties, including both highland and lowland plants. Both grow very well in my intermediate temps which can range from winter lows to 58/60 and summer highs being whatever mother nature throws at them. My summers aren't as hot as Texas summer but it's not unusual for my summer days regularly be in the 90's w/nights not going below 70, and both do equally well. If they had eyes...neither would be blinking at my temps.
The one difference I have noticed is that (for me anyway) the highland varieties bloom better w/more light than the lowlands. A good deal more actually. Especially the alba forms!
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