Are they in a clay pot ? I can't tell for sure. Even plastic pots if roots are touching sides of pots will dry out way to fast and burn the roots. Repot in plastic or sealed clay pots one size larger refresh with good well draining soil will help protect roots from heat exposure from cooking sides of pot. Place in a shady spot until recovered from repotting . If the roots are root bound and sitting against the sides of the clay pots which can burn the roots. These flowers love full sun but the heat can rob the roots of water sent to the flowers if dried out for small lengths of time in this heat wave. UGH !
