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 to prevent root rot.

Ensure good drainage to avoid waterlogged conditions.

Pruning is generally not necessary for Echinopsis oxygona, as it naturally forms a desirable clumping habit. If offsets become too crowded or a specific shape is desired, offsets can be removed.

Use a clean, sharp knife to detach them cleanly.

Propagation is easily achieved by offsets (pups) that form around the base of the parent plant. Gently remove offsets with a clean knife, allow the cut surface to callus over for a few days, then plant in well-draining cactus soil.

Repot every 2-3 years or when the cactus becomes root-bound, preferably in spring. Use a gritty, fast-draining cactus mix. Choose a pot only slightly larger than the current one to avoid overwatering and root rot.