Moon cactus pups can be propagated to expand a plant collection. These small growths emerge from the parent plant and can create new, independent cacti. Understanding their nature and care is key for successful cultivation.
Understanding Moon Cactus Pups
Moon cactus, Gymnocalycium mihanovichii, is a grafted plant composed of two distinct cacti. The colorful top portion, the scion, lacks chlorophyll, meaning it cannot produce its own food through photosynthesis. This scion is grafted onto a green, chlorophyll-rich rootstock, often a Hylocereus species, which provides nutrients for both parts.
Pups, or offsets, can emerge from either the colorful scion or the green rootstock. Pups from the scion will also be colorful and lack chlorophyll, making them dependent on grafting for survival. Green pups that emerge from the rootstock, however, contain chlorophyll and can potentially grow on their own roots if properly detached and cared for. The formation of these pups is a natural part of the moon cactus’s growth cycle.
When to Detach Moon Cactus Pups
Knowing when to detach moon cactus pups is important for successful propagation. Pups should be large enough to handle without damage, typically reaching at least half an inch or more. They should appear firm, plump, and healthy.
For green pups emerging from the rootstock, look for signs of initial root development, such as small aerial roots, as this increases their chance of successful rooting. Scion pups can be removed at a decent size, with detachment often driven by the need for quick grafting. Removing pups when they are ready helps prevent nutrient depletion from the parent plant.
How to Detach Moon Cactus Pups
Careful handling and proper tools are needed to detach moon cactus pups. Begin by sterilizing a sharp knife or razor blade with rubbing alcohol to prevent introducing pathogens. For pups emerging from the colorful scion, a clean, horizontal cut should be made as close to the main body of the scion as possible. These colorful pups require grafting onto a new rootstock.
For green pups growing from the rootstock, a clean cut at their base is appropriate. Gently twisting and turning the pup until it breaks off can also be effective, particularly if it’s loosely attached. Wearing gloves can protect your hands from the cactus spines.
Caring for Detached Moon Cactus Pups
After detaching moon cactus pups, allow the cut end to callus. Allowing the cut surface to dry and form a protective seal prevents rot when planted; this typically takes several days to a week. Place the detached pups in a dry, airy location away from direct sunlight during this callusing period.
Once callused, green rootstock pups can be planted in a well-draining cactus or succulent potting mix. Choose a pot with drainage holes and one only slightly larger than the pup’s diameter. Gently place the callused end of the pup into the soil, burying about one-third to one-half of its base for stability.
Avoid immediate watering; wait a few days to a week. Water sparingly, allowing the soil to dry completely between waterings. Place the potted pup in bright, indirect light and a warm environment for successful rooting. Colorful scion pups require immediate grafting onto a new, healthy rootstock.
Caring for the Parent Plant After Detachment
After pup removal, the parent moon cactus needs continued care. Inspect the detachment area. Allowing the cut area on the parent plant to dry and heal naturally prevents infection. Continue to provide the parent plant with its regular care routine, including appropriate watering and light conditions. Observe the cut for any signs of softening or discoloration.
Common Issues with Moon Cactus Pups
Several issues can arise when dealing with moon cactus pups. Lack of growth can stem from insufficient nutrients, improper care, or inadequate light and temperature. Ensuring the plant receives bright, indirect light and is in a warm area can help stimulate growth.
Rotting is another frequent issue, especially after detachment, often due to overwatering or insufficient callusing before planting. If a pup shows signs of rot, such as mushy spots, the affected area should be cut away with a sterile tool, and the pup should be allowed to re-callus before attempting to plant again. Green pups may fail to root if environmental conditions are not ideal or they are not sufficiently mature. Colorful scion pups will not root on their own and require grafting for continued survival.