Care Guides for Moon Cactus


Every 7d

Recommended Frequency

1 /2 cup of water

Recommended Amount

Water your Moon Cactus weekly in the spring and summer months. You can reduce the watering schedule to every two weeks in the fall and winter. Allow the soil to dry out between waterings.


Every 60d

Recommended Frequency

Fertilize your Moon Cactus every two months during spring using 5-10-10 fertilizer. Do not fertilize in winter.


Indirect Sun

Recommended

Indirect Sun or Filtered Sun is when sun exposure is being filtered through a sheer curtain or is not able to have the sun's rays directly hit the leaves/flowers of your plant.


Every 1095d

Recommended Frequency

Repot your Moon Cactus every three years, or once it outgrows its pot.


0°50°100°
45° - 60°

For moon cactus, maintaining a temperature range between 75 to 85 degrees Fahrenheit is ideal. This range is considered to be on the higher side for plant care, ensuring optimal growth and health.


Sandy Soil

Recommended Soil

Peat Soil is an acidic soil that retains a lot of moisture and slows decomposition. Due to such a high moisture retention this mix may require irrigation to help with draining. This soil type is best used when paired wit...

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40%

Moon cactus thrives best in environments with humidity levels around 40-60%, which falls into the average to high humidity range. Maintaining this humidity supports its health and vibrant coloration.

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Questions about Moon Cactus


A Moon Cactus, also known as Gymnocalycium mihanovichii, is a unique, colorful plant that consists of two different cacti grafted together. The top part, which lacks chlorophyll, showcases vibrant hues, while the bottom ...

Toxicity of Moon Cactus

Slightly Toxic to Humans

Moon cactus (Gymnocalycium mihanovichii) is generally considered non-toxic to humans. However, like many cacti, it has sharp spines that can cause physical injury if not handled carefully. There's no significant chemical toxicity associated with touching or ingesting parts of this plant, making it safe around humans in terms of toxicity. Always exercise caution to avoid puncture wounds from the spines.

Toxic to Dogs

Moon cactus (Gymnocalycium mihanovichii) is generally considered non-toxic to dogs. However, like many cacti, its spines can cause physical injuries such as punctures or irritations if a dog attempts to chew on or swallow it. Always supervise pets around plants to prevent accidents.

Toxic to Cats

Moon cactus (Gymnocalycium mihanovichii) is generally considered non-toxic to cats. However, like with any plant, ingestion can potentially cause mild gastrointestinal upset due to the plant's fibrous nature. It's always best to monitor your cat and keep the cactus out of reach to avoid any issues.

Common Pests and Diseases

Root Rot

Overwatering

To address root rot in moon cactus, first, stop watering immediately and allow the soil to dry out. If the plant is severely affected, remove it from its pot, trim away any black, mushy roots, and repot in fresh, well-draining soil. Ensure the pot has adequate drainage holes. Going forward, water only when the top inch of soil feels dry to the touch, and avoid letting the plant sit in water.

Use Plant Doctor in the app to diagnose a disease:

Shriveling and Discoloration

Underwatering

To address underwatering in moon cactus, gradually increase watering frequency, ensuring the soil is allowed to dry slightly between waterings. Use a well-draining soil mix to prevent waterlogging. During active growth periods, typically in warmer months, water more frequently, reducing in cooler, dormant periods. If the cactus has begun to shrivel or discolor, a consistent, appropriate watering schedule is crucial for recovery. Monitor the plant closely for improvements and adjust care as necessary.

Mealybug Infestation

Mealybugs are small, white, soft-bodied insects that feed on the sap of the moon cactus, weakening the plant and making it susceptible to disease.

To combat mealybugs, start by isolating the affected plant to prevent the spread to others. Use a cotton swab dipped in rubbing alcohol to dab directly onto the pests, effectively killing them without harming the plant. For more severe infestations, applying neem oil or insecticidal soap directly to the plant according to the product instructions can be effective. Ensure to treat all parts of the plant, including under leaves and in crevices, for thorough control. Regular monitoring and repeat treatments may be necessary to completely eradicate the pests.

Graft Failure

Incompatibility between the rootstock and scion or poor grafting technique

Graft failure in moon cacti, often indicated by a weak or dead scion, requires careful attention. To address this, ensure that both the rootstock and scion are healthy and compatible before grafting. Use a clean, sharp knife to make precise cuts for the graft, and secure the union firmly but gently. If the graft fails, remove the scion and attempt re-grafting with a new, compatible partner, following best practices for cleanliness and technique.

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