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Selenicereus monacanthus
Selenicereus monacanthus
Selenicereus monacanthus, commonly known as the Moon Cactus, is a spectacular epiphytic cactus known for its stunning flowers, which bloom at night. It's a fast-growing vine with long, slender stems and prominent ribs covered in spines. These spines can vary in color, with some exhibiting beautiful creamy, light-colored tones. The flowers are large and bell-shaped, and typically white or pale pink, and are highly fragrant. These cacti are incredibly popular in gardens and as houseplants for their unique beauty.
CategoryDetails
Plant TypePerennial plant
Estimated Plant Lifespan10 years lifespan
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: Animal

Notes: The Moon Cactus is primarily pollinated by nocturnal pollinators, such as moths and bats.

Watering Requirements

Method: Bottom watering

Frequency: When the soil is completely dry

Notes: Allow the soil to dry out completely between waterings to prevent root rot.

Humidity Requirements

Level: Low

Temperature Range

Min: 10°C

Max: 35°C

Alternative NamesHylocereus monacanthus

Cultivars

Opuntia microdasys
Bunny Ears Cactus
Opuntia microdasys
Both cacti thrive in similar conditions, such as well-drained soil and plenty of sunlight. Their shared needs for similar conditions create a synergistic planting opportunity.
Agave attenuata
Swan-neck Agave
Agave attenuata
Both plants have similar water requirements, benefit from similar light conditions, and will appreciate well-drained soil. This allows for easy maintenance, as they won't outcompete each other in water or nutrient demands.
Echeveria elegans
Mexican Snowball
Echeveria elegans
These succulent companions share similar watering needs and prefer dry spells between waterings. This promotes a balanced environment for both plants, reducing water stress for the moon cactus.
Hibiscus rosa-sinensis
Chinese hibiscus
Hibiscus rosa-sinensis

Hibiscus require more consistent moisture than the Moon Cactus, and would potentially outcompete the Moon Cactus for water and nutrients, ultimately stressing the cactus.

Mealybugs

Mealybugs are tiny, white, cottony insects that feed on the plant's sap. Infestation causes stunted growth and discolored stems, as well as producing a sticky residue called honeydew.

Scale Insects

Small, oval-shaped insects that suck the sap from the stems. Scale insects are often hard to spot and can lead to yellowing and overall decline of the plant.

Steps:

    • Take a healthy stem cutting from the Moon Cactus, at least 4-6 inches in length.
    • Remove any leaves or flowers from the bottom 2 inches of the cutting to minimize water loss.
    • Allow the cutting to callous over, usually a couple of days.
    • Plant the cutting in well-draining soil mix, maintaining moisture, but preventing soggy conditions.
    • Place the cutting in a warm spot with bright, indirect light.

Neem Oil

A natural insecticide effective against mealybugs, scale insects, and other pests. Helps keep your plant free from harmful pests.

Aloe Vera Gel

Can help heal minor wounds or cuts from pruning or pest infestations.