P. 'Titan' have a incertain taxonomy status but we think it is a hybrid ( may be P. agnata x macrophylla)
cultivate like all the normal mexican and their hybrids .
for my part , in mineral calcareous clayed substrate .
here in europe
in summer outdoor , in shade or in a mornig sunlight , protected from rain
watering by capillarity all the 15 days or a time monthly.
in winter indoor , 12-15°c , no watering or just to avoid desiccation, good light .