Bonjour
what is called dormant for Mexican ping is, in fact, the passage has the dry period, in Mexico from November to May
they shall protect this drought, becoming succulent mostly.
in this period, the filiforms dry substrate (except moctezumae) for other, slightly moist substrate to avoid desiccation.
for temperate, dormancy, is the transition from winter without damage, most form in August one hibernaculum that protects them.
jeff