Allow soil to dry out completely between waterings. Water thoroughly when the soil is dry, usually in spring and summer.

Reduce watering significantly in fall and winter, providing only enough to prevent extreme dehydration. Overwatering leads to root rot.

Pruning is generally minimal for Pilosocereus armatus, primarily for removing dead or damaged stems. If the plant becomes too large, you can carefully cut back stems.

Use a sharp, sterilized knife or saw and allow cuts to callus before repotting.

Pilosocereus armatus is typically propagated by stem cuttings. Allow cuttings to dry and form a callus for several days to weeks before planting in well-draining soil.

Use a rooting hormone to encourage faster root development.

Repot every 2-3 years or when the plant outgrows its container. Choose a pot that is slightly larger than the current one with drainage holes. Use a fast-draining cactus or succulent mix.

Repot in spring when active growth begins.