The costus genus prefers well-drained, rich soil in a spot that receives partial shade to full sun. Generally, it needs regular watering, but should not be overwatered. Start by preparing the planting area with composted matter, creating a hole twice the size of the root ball. Position the costus plant ensuring the crown is level with the soil surface, fill in the hole, firm the soil around it and water thoroughly. Deferring to specific species care instructions within the costus genus for best results is important.