How to Water large-thorned agave?
Water thoroughly then let soil dry out completely

large-thorned agave · Agave macroacantha
Grow under glass in cactus compost in full light. Water freely in summer, giving a low-nitrogen feed three or four times. Water less in autumn and keep dry in winter. Can move outdoors for summer. See houseplant cacti and succulent cultivation for further information
Water thoroughly then let soil dry out completely