Water thoroughly when the soil is completely dry, typically every 2-4 weeks during the growing season. Reduce watering significantly in winter, allowing the soil to dry out between waterings.

Overwatering is a common cause of root rot, so err on the side of underwatering.

Pruning is generally not necessary for Euphorbia mammillaris unless removing dead or damaged stems or to control its size. Use a sharp, sterile knife or shears.

The milky white sap can be irritating, so wear gloves and eye protection. Seal any cuts with charcoal powder.

Propagation is best done by stem cuttings. Allow cuttings to callus for a few days to a week before planting in well-draining soil. Water sparingly until roots develop.

This method is most successful during the warmer spring and summer months.

Repot every 2-3 years or when the plant becomes root-bound. Use a gritty, well-draining potting mix, such as a cactus or succulent blend. Choose a pot that is slightly larger than the current one.

Repot in spring or early summer when the plant is actively growing.