Peruvian Apple Cactus

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) preferred; aim for at least 6 hours of direct sunlight. Indoors, a south-facing window is ideal. Rotate the pot regularly to prevent the column from leaning toward the light source.

Prefers low to moderate humidity (40-60%. Most homes are fine, but a pebble tray helps in winter when heating dries the air out). No special humidity measures needed - average indoor air is fine, and high humidity (60-80%. Group your plants together, set them on a pebble tray with water, or run a humidifier nearby) can encourage rot.

Fast-draining cactus soil is essential. Add extra perlite to commercial cactus mix for even better drainage. The plant is highly sensitive to wet soil.

Mealybugs and scale are the main pest concerns; treat with rubbing alcohol on a cotton swab or neem oil. Root rot from overwatering is the most common cause of decline. The sharp spines cause physical injury - handle with thick gloves or folded newspaper.