Irish Mittens

full sun (6 or more hours of sun hitting the leaves per day. South-facing window, no obstructions. Under grow lights, keep them 4-8 inches away for 12-14 hours) is strongly preferred. Place within a foot of a south-facing window indoors for best results. It can manage partial shade but will not thrive or color up well. Outdoors, give it the sunniest spot available.

Prefers dry conditions. Average indoor air is fine. This is not a humidity-sensitive plant and does not need misting (note: misting does not actually raise humidity meaningfully. A pebble tray or humidifier is more effective).

Cactus and succulent mix with 70-80% mineral grit (coarse sand, pumice, or perlite). Standard potting soil retains too much moisture. Well-draining containers with drainage holes are essential.

Root rot is the main cause of death. Overwatering in winter is particularly dangerous. The glochids (tiny barbed bristles in the areoles) are a constant hazard -- they detach easily and are painful and stubborn to remove. Scale, mealybugs, and cochineal insects can infest the pads. In warm, moist climates it can escape gardens and become invasive.