Schomburgkia overnight temperature tolerance

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Does anybody know overnight low temperature tolerance for these Schomburgkia species? (Yes, they've been renamed.) I bought them over the past year from Ecuagenera. Some are now rooting for the first time, with swelling eyes.

I might guess they vary since they come from different elevations. We're going to have clear nights in the 40s / 4-10C for a while with sunny days in the 60s F / 15-21C.

Some of them experienced our very hot summers partially outdoors. I brought them into the house when we had nights above freezing in the 30s F / 1-5C, then moved them back onto the patio when it warmed up.

Schom. crispa - low elevation, hot to warm grower

Schom. lueddemanniana - low elevation, hot to warm grower

Schom. rosea - very low elevation, hot grower

Schom. splendida - mid elevation, warm to cool grower

Schom. wallisii - warm to cool grower