Allow soil to dry out completely between waterings. Water thoroughly when dry, but avoid waterlogging, which can lead to root rot.

Reduce watering significantly during winter dormancy to mimic its natural arid environment.

Pruning is generally not required for Echinocactus platyacanthus. Remove any dead or damaged tissue promptly with a clean, sharp knife to prevent disease. Focus on maintaining the natural spherical shape.

Propagate primarily through seeds. Sow seeds in a well-draining cactus mix and maintain warmth and moisture.

Cuttings are less common and can be prone to rot; if attempted, ensure the cutting calluses over before planting.

Repot every 2-3 years or when the cactus outgrows its container. Use a gritty, well-draining cactus potting mix. Choose a pot only slightly larger than the current one. Repot in spring.