Water thoroughly when the soil is completely dry, typically every 2-3 weeks during the growing season. Reduce watering significantly in winter, allowing the soil to dry out between waterings to prevent root rot.

Ensure good drainage to avoid waterlogged conditions.

Pruning is generally not required for *Cleistocactus winteri* beyond removing dead or damaged stems. If it becomes too large or ungainly, stems can be carefully cut back. Use a clean, sharp knife or pruning shears.

Propagate by stem cuttings, which root easily. Allow cuttings to callus over for a few days before planting in well-draining cactus mix. Alternatively, seeds can be sown in a warm, sterile medium.

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

Repot in spring.