Trees in Containers
by Greg
(Bakersfield, CA)
Thanks in advance for your help, Greg
Doug says that real terra cotta is going to be fine (avoid black like the plague). The deal with good pottery is that it also "sweats" water and this (I understand) helps reduce the heat loss by evaporative cooling. Now, colored plastic is going to be hotter than real terra cotta pots but not as hot as black coloring.
So the answer to your question is real clay/terra cotta is fine, colored terra cotta plastic is almost as good and stay away from darker, non-reflective colors.