The only problem would be the freeze, Four. I take lots of cuttings from pentas, but I keep them in pots until after there is no freeze threat. Just planted 11 of them last week. They are doing well now in full sun.

You and I each had comments in here three months ago. Now I see one comment, and it is not of three months ago:

Later : I found that, having no response at that time in this forum, six days later I posted same in Florida Gardening forum; our comments are in that thread.

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I will keep them in the relentless sun location until they complain.

No complaints from them. On the contrary.

(My concern arose from the advice: "Morning sun, afternoon shade.", reiterated to me by the entomologist who started and operated the butterfly house at Lukas, who sold the Pentas to me.)

Pentas do great in full sun. Like any other plant they will need more water the more sun they get.