Bunny ear cactus

Edible prickly pear / nopal

Same genus, but much larger pads (15–60 cm) and thick visible spines as well as glochids. Cultivated as a food crop; the fruit is the 'tuna' or prickly pear of Mexican cuisine.

Red-brown bunny ears

Often considered the red-glochid form of O. microdasys (var. rufida) or a separate species. Visually almost identical except glochid colour.

Cholla cactus

Related genus with cylindrical (not flat) jointed segments and long visible spines. More dangerous to handle but glochids are smaller.

Full direct sun — 4–6 hours minimum.

Bunny ear cactus is a desert plant and demands the brightest spot in the home. A south or west window with several hours of direct sun is ideal. In dim conditions the pads etiolate (stretch and become pale), new growth emerges spindly, and the plant declines slowly over months.

Seasonal: Move outdoors to a sunny balcony from late May through September if possible — Nordic summer sun produces dramatically thicker, more compact growth than any indoor position.

Every 3–4 weeks in summer; once every 6–8 weeks in winter.

Soak deeply when the soil is bone-dry, then let it dry out completely before watering again. Bunny ear cactus is one of the most drought-tolerant plants in cultivation — it can survive 6+ months without water in cool conditions. Overwatering is the main killer; the pads turn soft and translucent, and the base develops a sour-smelling rot.

Seasonal: Cut watering to once every 6–8 weeks from October through March. Some growers keep their plants completely dry in winter at temperatures below 15 °C — this drought-induced rest is what triggers spring flowering on outdoor specimens.

Cactus mix or gritty mineral soil with sharp drainage.

1 part standard mix to 2 parts coarse perlite, pumice, or grit. The mix should drain within 5 seconds of watering. Heavy clay or peat-heavy mixes hold too much water and rot the base within a season.

20–40 %; prefers dry air.

No humidity demands. Bunny ear cactus actively prefers dry indoor air; humidity above ~60 % combined with cool temperatures encourages fungal spots on the pads.

10–35 °C; tolerates brief light frost when dry.

Tolerates wider temperature swings than most houseplants. The plant survives brief frost down to about −5 °C if completely dry, but indoor specimens are safer kept above 10 °C in winter. Sustained cold and damp is the killer combination.

Half-strength cactus feed twice during the growing season.

A low-nitrogen cactus fertiliser at half label rate, applied once in late spring and once in mid-summer. Heavy feeding produces soft floppy pads that lose their characteristic compact shape. No feeding from October through March.

Remove unwanted pads with kitchen tongs and a clean blade.

Use kitchen tongs to grip a pad without touching it, then cut through the joint between pads with a clean sharp knife. The cut pad can be rooted as a new plant (see propagation). Never handle pads bare-handed — see the section below on glochids.

Every 3–4 years in spring; the plant tolerates being rootbound.

Wear thick leather gloves and wrap the plant in several layers of newspaper before lifting. Move up by one pot size only. A heavy ceramic or terracotta pot prevents tipping; tall plastic pots fall over once the plant has accumulated several pads.

No chemical toxicity. The hazard is entirely mechanical: glochids embed in skin and mucous membranes, where they cause persistent itching, inflammation, and granulomatous reactions in some individuals. Eye contact is genuinely dangerous and can cause corneal abrasion. Always handle with thick gloves and eye protection.

No chemical toxicity but mechanical injury is significant. Cats that bite or rub against the plant can embed glochids in lips, tongue, paws, and nasal passages — often requiring veterinary removal under sedation. Position the plant where pets cannot reach it.

Same mechanical hazard as cats. Dogs that brush against the plant or sniff a pad commonly get glochids in the muzzle and forepaws. Removal usually requires sedation and tweezers.