How to Grow and Care for Euphorbia Monstrose

The Euphorbia monstrose has a unique, sculptural appearance resulting from a genetic mutation. This mutation causes random, distorted growth, creating a lumpy, asymmetrical form that makes each plant unique. Though often mistaken for a cactus due to its spines, it is a succulent from the large Euphorbia genus.

Euphorbia Monstrose Care

Light

This succulent grows best in bright, indirect sunlight. An ideal indoor location is near a south or west-facing window where it can receive light without being exposed to harsh midday rays. While it can handle some direct sun, too much can cause sunburn. Acclimate the plant gradually to brighter conditions to prevent this.

Soil

This plant requires a soil mix with excellent drainage to prevent moisture-related problems. A commercial potting mix for cacti and succulents is a reliable choice. You can improve drainage by amending the mix with inorganic materials like perlite or pumice to ensure water does not linger around the roots.

Water

Use the “soak and dry” method for watering. Water the plant thoroughly, allowing excess to drain completely, and then wait for the soil to dry out before watering again. During the spring and summer growing season, it may need water as often as once a week. In the winter, reduce watering frequency significantly as growth slows.

Temperature

Euphorbia monstrose prefers warm conditions and is not cold-hardy, meaning it can be damaged or killed by frost. It is best suited for USDA hardiness zones 10a to 11b. If you grow this plant outdoors in a cooler climate, it must be brought inside before the first frost arrives.

Fertilizer

This succulent does not have heavy feeding requirements. During the spring and summer growing season, apply a balanced, all-purpose fertilizer diluted to quarter or half-strength once a month. Avoid fertilizing during the dormant winter months.

Handling and Propagation

Take precautions when working with this plant. It produces a milky white latex sap when cut or damaged that is a skin and eye irritant and is toxic if ingested. Always wear gloves and protective eyewear when handling the plant to prevent contact with the sap, especially when taking cuttings.

Propagate this succulent using stem cuttings. With a clean, sharp knife, remove a section of the plant. Allow the cut end to dry and form a callus, which can take several days to a week. This step is necessary to prevent the cutting from rotting when planted.

Once callused, place the cutting in a pot with dry, well-draining soil. Do not water it immediately; place it in bright, indirect light. Roots will typically form within several weeks, at which point you can begin to water sparingly.

Common Issues

A frequent problem is root rot, which results from overwatering or poor drainage. Signs of rot include the base of the plant turning yellow, brown, or black and becoming soft and mushy.

Mealybugs can also affect the plant. These small, white insects look like cottony fluff and cluster in the crevices of the plant’s irregular growth. Treat an infestation by dabbing the insects with a cotton swab dipped in 70% isopropyl alcohol.