Care instructions:

Light: Bright light, including some direct sun.

Water: Allow the soil to dry out completely between waterings, then water thoroughly. Overwatering can cause root rot.

Soil: Well-draining cactus or succulent soil mix.

Fertilizer: Monthly during growing season (spring and summer) with a cactus or succulent fertilizer.

Humidity: Tolerates normal indoor humidity.

Propagation: Propagate by separating offsets or by taking stem cuttings and rooting them in moist soil.

About this plant:

Gymnocalycium mihanovichii is a species of cactus native to South America, particularly Argentina. It is commonly known as the chin cactus or the red cap cactus due to its distinctive appearance.

One of the most notable characteristics of Gymnocalycium mihanovichii is its brightly colored, spherical stem. The stem can be various shades of green, pink, or red, and is covered in small, white spines. The plant typically grows to a height of 3 to 6 inches (8 to 15 cm) and can spread to about 4 inches (10 cm) in diameter.

Gymnocalycium mihanovichii is often grown as a houseplant or as part of a cactus or succulent collection due to its unusual appearance. It is a relatively low-maintenance plant, preferring well-draining soil and bright, indirect light. It is important to avoid overwatering, as the plant is susceptible to root rot if the soil remains too moist.

One interesting feature of Gymnocalycium mihanovichii is its ability to be grafted onto another cactus species, particularly Hylocereus undatus, commonly known as the dragon fruit cactus. When grafted, the Gymnocalycium mihanovichii stem grows from the top of the dragon fruit cactus stem, creating a unique and eye-catching plant known as a "moon cactus". The grafted stem of the Gymnocalycium mihanovichii does not produce chlorophyll, which is why it is often brightly colored. The dragon fruit cactus provides the grafted stem with the necessary nutrients to survive.

Overall, Gymnocalycium mihanovichii is a fascinating and unique plant species that is prized for its unusual appearance and ease of care. Whether grown as a standalone plant or as part of a grafted arrangement, it is sure to add a pop of color and interest to any cactus or succulent collection.