Boob Cactus (Fukurokuryuzinboku)
Myrtillocactus geometrizans 'Fukurokuryuzinboku'
The Boob Cactus is a slow-growing, blue-green cactus with rounded tubercles that give this unusual cultivar its common name. Its compact, sculptural shape makes it a natural fit for a sunny succulent display. Give it a sunny spot, let the potting mix dry between waterings, and use a planter with drainage holes.
Light
Full Sun
Water
Low
Difficulty
Easy
Humidity
Low
Pet Friendly
While non-toxic if ingested, the small spines can still cause mechanical injury or irritation if handled roughly or chewed by pets.
Full care guide
Boob Cactus Care
Grow Myrtillocactus geometrizans 'Fukurokuryuzinboku' with hard light, a soak-and-dry watering rhythm, and a gritty mineral mix that never stays wet.
Read the guideCare Notes
Full guide →Light
Place your Boob Cactus in the brightest spot possible
It thrives in direct sunlight or very bright, filtered light. Indoors, a south-facing window is ideal for maintaining its blue-green hue.
Water
Use the ‘soak and dry’ method
Allow the soil to dry out completely before watering. In winter, reduce watering to once every 4-6 weeks to prevent root rot during its dormancy.
Soil and Planter
Use a very gritty, well-draining cactus mix
Adding extra pumice or coarse sand is highly recommended to ensure drainage.
Humidity and Temperature
This cactus prefers warm temperatures between 65°F and 85°F
It is not frost-hardy and should be kept away from cold drafts or temperatures below 50°F.
Seasonal Care
During winter, the plant enters a rest period
Keep it in a cool (not cold) spot and keep it dry to mimic its natural desert habitat. Avoid high humidity as it can lead to fungal issues.
Common Issues
Soft leaves or persistently wet soil are common signs that the roots are getting too much water. Let the mix dry, then check that the drainage holes are clear.
In-Depth Care & Growth
Feeding & Soil
Fertilizer
Water-soluble cactus fertilizer
Soil
Highly porous, mineral-based substrate; 50% cactus potting soil mixed with 50% grit/pumice.
Physical Attributes
Mature Size
2 to 4 feet tall indoors
Growth Rate
Slow
Propagation
Stem cuttings allowed to callus for several days before planting in dry soil.
Common Varieties
Myrtillocactus geometrizans (Standard)
This glaucous blue-green columnar cactus has unique, smooth, breast-like tubercles that replace traditional ribs, creating a distinctively sculpted and "bumpy" silhouette.
Myrtillocactus geometrizans 'Cristata' (Crested form)
This variety features glaucous blue-green skin and the distinctive breast-like tubercles of the Boob Cactus arranged in a dense, undulating, fan-shaped crested growth pattern.
Myrtillocactus geometrizans 'Elite'
A spineless, glaucous blue-green columnar succulent distinguished by its especially smooth and pronounced breast-like tubercles.