None of the species are very tolerant of severe winter cold, with the hardiest, P. borbonia, P. ichangensis and P. lingue, surviving temperatures down to about −12 °C (10.4 °F); they also require continuously moist soil, and do not tolerate drought.
Ningunha das especies é moi tolerante a fríos severos, agás P. borbonia, P. ichangensis e P. lingue, que sobreviven temperaturas debaixo dos -12 °C; tamén precisan de solos húmidos continuos, e non aturan a seca.