Not a perennial, but [url=https://www.acgnursery.com/images/Portulaca.jpg]portulaca[/url] is an annual succulent (sort of like cactus) that really likes the heat and dry. That would be good...
There is a like perennial called [url=https://www.kertpont.hu/uj/forumkep/delosperma1.jpg]Delosperma[/url] the comes in [url=https://www.cactusjungle.com/images/delosperma_floribundum.jpg]a few[/url] [url=https://www.floralimages.co.uk/images/delosperma_nubigenum_f89.jpg]different colors[/url]
Try that one too!
Be safe and well,