Myrtillocactus geometrizans ‘Fukurokuryuzinboku’, commonly known as the Blue Ghost Cactus, is a distinctive succulent. This unique cultivar of the Blue Myrtle Cactus features a striking blue-grey, almost powdery coloration that gives it its “ghostly” moniker. Its columnar growth habit and often segmented stems contribute to its sculptural appeal. The plant’s aesthetic charm lies in its unusual hue and architectural form, which stands out in any plant collection.
Care Requirements for Blue Ghost Cactus
Light Needs
The Blue Ghost Cactus thrives in bright, direct sunlight, requiring at least six hours of intense light daily to maintain its characteristic coloration and compact growth. Placing it in a south-facing window indoors or in a location with full sun outdoors is ideal. Insufficient light can lead to etiolation, causing the plant to stretch abnormally and become pale. Conversely, sudden, intense direct sunlight can cause sunburn, appearing as bleached or scarred patches on the stem.
Watering Practices
The “soak and dry” method is highly recommended for watering. Thoroughly water the plant until water drains from the bottom of the pot, then allow the soil to completely dry out before the next watering. Overwatering is a common pitfall and can quickly lead to root rot. During its dormant period in winter, significantly reduce watering frequency, providing just enough moisture to prevent the stem from shriveling.
Ideal Soil Mix
A well-draining soil mix is essential for preventing waterlogging. Standard potting soil retains too much moisture and is unsuitable for this cactus. Instead, opt for a commercially available succulent or cactus potting mix. For enhanced drainage, amend a regular potting mix with perlite, pumice, or coarse sand.
Temperature and Airflow
The Blue Ghost Cactus prefers warm temperatures during its active growing season, between 70 to 90 degrees Fahrenheit (21-32°C). During its winter dormancy, it can tolerate cooler temperatures, ideally between 45 to 55 degrees Fahrenheit (7-13°C). Good air circulation is important, particularly in humid environments. Stagnant, humid air can create conditions conducive to fungal diseases.
Fertilization
Fertilization is only necessary during the active growing season. A balanced, diluted liquid fertilizer formulated for cacti or succulents. Apply fertilizer at half or quarter strength once every two to four weeks. Avoid fertilizing during the fall and winter when the cactus is dormant, as this can stress the plant.
Propagating Blue Ghost Cactus
Propagating the Blue Ghost Cactus is most commonly achieved through stem cuttings. Select a healthy segment and make a clean cut. After taking the cutting, allow the cut end to “callus over,” meaning it dries out and forms a protective scab. This process typically takes one to two weeks, preventing rot when the cutting is eventually planted.
Once the cut end has callused, plant the cutting upright in a well-draining cactus or succulent potting mix. Do not water immediately; instead, wait about a week before providing a light watering. Place the potted cutting in a bright location with indirect light, gradually introducing it to more direct sun as it establishes. Roots typically begin to form within several weeks to a few months.
Troubleshooting Common Issues
Overwatering is the most frequent cause of problems, leading to root rot. Symptoms include a soft, mushy base or stem, and a foul odor. Insufficient light causes etiolation, where the cactus stretches and becomes pale; moving the plant to a brighter location will prevent further stretching, though the elongated growth will not revert. Sudden exposure to intense sunlight can cause sunburn, appearing as bleached or brown patches on the stem. To prevent this, gradually acclimate the cactus to new, brighter conditions over several weeks.
Blue Ghost Cacti can occasionally encounter pests such as mealybugs or spider mites. These can be identified by small, cottony masses or fine webbing on the plant. Treat infestations by wiping the affected areas with rubbing alcohol or by applying an insecticidal soap.