Have you noticed the colorful small cacti in the big box stores and nurseries? The round spiny balls are dressed in various colors such as red, yellow, and pink on thick, green stems. These are grafted cacti called ‘Moon Cactus’ or ‘Hibotan.’ Many come from Korea. Koreans have perfected the process to create ‘Moon Cactus.’
The colorful top is a cactus called Gymnocalycium mihanovichii var. friedrichii which does not have green chlorophyll. These cacti would perish as seedlings because they cannot produce “food.” Without chlorophyll, photosynthesis cannot occur. The seedlings need to be grafted onto a green chlorophyll-filled base. Commonly used bases are Hylocereus trigonus, Hylocereus undatus, Cereus peruvianus, and Trichocereus spachianus.
The cactus being grafted (the top part) is called the scion, and the base is the rootstock. The base is beheaded about an inch from the soil. The scion is cut and placed on top of the rootstock after the edges are trimmed to slope downward. The vascular cambiums of both plants are aligned, and rubber bands are used to hold the two in place. Approximately two to three weeks are required for the wound to heal. At this point, the rubber bands may be carefully removed. The compatibility of both plants is essential for success. As compatibility diminishes, so does the success of grafting. Unfortunately, the two cacti don’t grow at the same speed. Eventually, they will split and become unattached. At this point, you can graft a new rootstock to the scion that is the appropriate size.
The ‘Moon Cactus’ prefers bright indirect light on a sunny windowsill. Feed with cactus fertilizer every month from April to September. Use unglazed shallow pots. Do not use glazed pots because excess water will rot the cactus. Water thoroughly, allowing water to drain through the drainage holes and remove the excess water from the drainage dish. Don’t water again until the pot is thoroughly dry. Water during the summer months; suspend watering in the winter. Repot in the spring to replenish nutrients.
The ‘Moon Cactus’ is easy to grow but also easy to make. Anyone can learn to graft -- check out the many YouTube videos that demonstrate this age-old process.
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