Blue candle cactus (Myrtillocactus schenckii)
Care, watering, light and tips for Blue candle cactus on Floravia.
Quick facts
- Family: Cactaceae
- Difficulty: Easy to care for
- Watering: every 18 days
- Light: Full sun
- Temperature: 10–40 °C
About Blue candle cactus
Myrtillocactus schenckii, also known as the black garambullo, is a slow-growing, branched columnar cactus that can reach several meters in height. It is characterized by its dark bluish-green, almost black stems, and prominent ribs with short spines. It makes an excellent choice for desert gardens, rockeries, or as a striking standalone specimen due to its unique architectural beauty.
Native range
Central and southern Mexico
Care tips
It requires full sun for optimal growth and intense stem coloration. Watering should be moderate in spring and summer, allowing the substrate to dry out completely between waterings, and very sparse or none in winter. Use a well-draining substrate specifically formulated for cacti and succulents. A common mistake is overwatering, which can lead to root rot, especially during colder months.
How to save a dying Blue candle cactus
- Warning signs
- Soft, watery stem, dark/black spots, rotten base. Yellowish or whitish discoloration from too much sun.
- First aid
- Stop watering, check roots for rot. If rot, cut affected parts with sterile knife. Relocate to partial shade if sunburned.
- What kills it
- Overwatering, especially in winter or low light. Also intense direct sun without acclimatization.
- Can it be saved?
- Yes, if rot hasn't invaded the entire stem or roots. Act quickly at the first sign of softening.