How to Fertilize spider web-spined Easter lily cactus?
Very dilute low nitrogen cactus feed in warm growth season

spider web-spined Easter lily cactus · Echinopsis arachnacantha
Grow under glass in a loam-based potting compost with added grit. Water moderately when in growth, sparingly when dormant. Apply a balanced liquid fertiliser two or three times in the growing season. See houseplant cacti and succulent cultivation for more advice
Very dilute low nitrogen cactus feed in warm growth season