Eriosyce, a genus of cacti, thrives in well-draining soil with minimal organic content. Favor a mix dominated by coarse sand, gravel, or pumice for optimal drainage. They require abundant light, preferably full sun, to maintain health and shape. Watering should be sparse, mirroring the arid environments they originate from; ensure the soil dries out between waterings to prevent root rot. Plant deeply enough to stabilize the cactus, without burying it too deeply to avoid stem rot. Acclimate gently to direct sunlight and avoid overwatering during the initial growth phase.