How To Grow and Care for Moon Cactus

moon cactus

Moon cactus, also known as Gymnocalycium mihanovichii ,is a unique and colorful cactus that is easy to care for and makes a great addition to any plant collection. This cactus is native to South America and is a popular choice among cactus enthusiasts due to its vibrant colors and unique shape.

Moon cactus is member of Cactus family also known by the common names ruby ball cactus or cactus with red top .It’s a unique and eye-catching succulent that can add a pop of color to any indoor or outdoor space.

Unlike other cacti, Moon Cactus lacks chlorophyll and cannot produce its own food. Instead, it relies on a host plant for survival. They are easy to grow and care for, making them a great addition to any indoor garden.

In this article, we will discuss everything you need to know about growing and caring for a Moon Cactus.

Understanding Moon Cactus

Moon cactus is a grafted cactus, which means that it is created by attaching two different cactus species together. The cactus with a red top is usually a Gymnocalycium mihanovichii, which is a small, round cactus that comes in a variety of colors. The rootstock, or base, is usually a Hylocereus cactus, which provides the cactus with the necessary nutrients and support.

Grow & Care

These colorful cacti are small, round, and usually feature a brightly-colored top that is grafted onto a different cactus rootstock.. Here are some tips on how to grow and care for Moon Cactus.

Choosing and Preparing the Right Environment

The first step in growing and caring for a Moon Cactus is to select and prepare the right environment. Moon Cacti thrive in bright, indirect light and can tolerate some direct sunlight. However, they should be protected from intense heat and direct sunlight during the hottest parts of the day. If grown indoors, Moon Cacti should be placed near a window that receives bright, indirect light for at least six hours a day.

yellow moon cactus
Yellow moon cactus Source: Thomas Quine

Moon Cacti also require a warm and humid environment to thrive. The ideal temperature range for Moon Cacti is between 70 and 80 degrees Fahrenheit, with humidity levels between 40% and 60%. To achieve the right humidity levels, consider using a humidifier or placing a tray of water near the plant.

Soil Requirements

When it comes to soil and potting requirements, Moon Cacti prefer a well-draining, sandy soil mix. Choose a pot with drainage holes to allow excess water to drain away from the roots. It’s also a good idea to add a layer of gravel at the bottom of the pot to improve drainage.


Moon cactus requires bright but indirect light to grow and thrive. It is best to place them in a spot that receives ample sunlight, such as near a window. However, avoid direct sunlight as it can cause damage to the plant. You can also supplement the natural light with artificial lighting if necessary.


Watering is a critical aspect of caring for a Moon Cactus. While they don’t require frequent watering, it’s important to keep the soil moist but not waterlogged. In general, Moon Cacti should be watered once every two weeks during the growing season and once a month during the dormant season.

When watering, be sure to use room temperature water and avoid getting water on the plant’s body. Overwatering can lead to root rot, while under watering can cause the plant to wilt and die. To prevent overwatering, it’s a good idea to check the soil moisture level before watering. Stick your finger in the soil up to the second knuckle. If the soil feels dry, it’s time to water.


Fertilization is also essential for the health of a Moon Cactus. During the growing season, fertilize once a month with a balanced fertilizer diluted to half strength. Avoid fertilizing during winter, as the plant is not actively growing.

pink moon cactus
Pink moon cactus Source: Thomas Quine


Moon cactus prefers warm temperatures, between 70-80°F (21-27°C). It can tolerate slightly cooler temperatures during the winter months, but avoid exposing it to temperatures below 50°F (10°C), as this can damage the cactus.


Propagating Moon Cacti is relatively easy and can be done through offsets or grafting. Offsets, also known as pups, are small cacti that grow from the base of the parent plant. To propagate through offsets, simply remove the pup from the parent plant and replant it in a new pot with well-draining soil. If you’re propagating a Moon Cactus, make sure to keep it in a warm, humid environment and avoid overwatering.


Grafting involves attaching a Moon Cactus to a rootstock plant with chlorophyll to provide it with the nutrients it needs to survive. Grafting can be done by cutting the top of the Moon Cactus off and attaching it to the rootstock plant. The two plants should be held together with grafting tape until the Moon Cactus has established roots.

Pests and Disease

Moon Cacti are generally healthy plants, but they can still encounter issues such as pests, diseases, and growth problems. Spider mites, mealy bugs, and scale insects can infest your Moon Cactus, while root rot, stem rot, and fungal diseases can damage the plant.

To prevent these problems, keep your Moon Cactus in a clean environment, avoid overwatering, and remove any dead or damaged plant parts promptly. If your Moon Cactus does encounter any issues, identify the problem and take appropriate action, such as treating with an insecticide or fungicide.


Growing and caring for a Moon Cactus is an easy and enjoyable experience. With proper lighting, temperature, and soil conditions, along with careful watering and fertilization, you can enjoy a healthy and vibrant Moon Cactus in your indoor garden. If you encounter any problems, take quick action to prevent further damage to the plant. Follow this comprehensive guide, and you’ll have a thriving Moon Cactus in no time.

Why Moon Cacti Are Special?

Moon Cacti, also known as Gymnocalycium mihanovichii, are native to South America and are prized for their bright and colorful tops. These cacti are actually grafted together from two different cactus varieties, with the colorful top being a mutation that cannot survive on its own. As a result, Moon Cacti are relatively small and compact, making them perfect for indoor gardening.

Can overwatering damage Moon cactus?

Watering your Moon Cactus is one of the most critical aspects of its care. Overwatering or underwatering can cause damage to your plant. Allow the soil to dry out completely between watering sessions, and avoid getting water on the top of the Moon Cactus.

How many methods are used to propagate moon cactus?

Propagation Moon Cactus is easy to propagate, and there are several methods to do so. One method is to use stem cuttings and let them callus over for several days before planting them in well-draining soil. Another method is to remove the colorful top of the Moon Cactus and graft it onto another cactus rootstock.

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