Eulychnia acida

While it survives on the dense camanchaca coastal fogs in its harsh native habitat, Eulychnia acida is an active summer grower that responds exceptionally well to cultivation. In a coastal Zone 10b environment, it thrives outdoors where it can enjoy bright light and heat, but a position beneath the protective diffusion of shade cloth ensures the intense afternoon sun won't bronze or scorch the younger growth. Because it is highly susceptible to root rot in stagnant moisture, it demands an uncompromisingly fast-draining, porous substrate—such as a heavy blend of pumice, decomposed granite, and calcined clay. Housed in a deep, breathable raw cement pot, it appreciates thorough, deep waterings during the peak heat of spring and summer, provided the mineral mix dries out completely between soakings. As temperatures drop in the autumn, water must be drastically reduced, enforcing a strict, dry dormancy throughout the winter months to protect its roots from cold, wet conditions.