I don't grow Chico, but I have several cybister x papilio hybrids, sold from the Dutch as 'Papillio', but they look identical to Lima and they are outdoor with foliage in very good shape after a couple of night at 27F (-2.7°C) and several at 28-29F. Soil is just a commercial peaty one and plants are in pots without any overhead protection and got lots of rain. Angelo Porcelli south of Italy