For optimal growth, iodanthus plants generally require well-drained, fertile soils and a sunny to partly shaded location. Amend the planting site with compost or organic matter first. Dig a hole twice the size of the plant's root ball, place the plant in, and fill the hole with soil, ensuring the top of the root ball is level with the surface. Water thoroughly after planting. Regular watering, especially during drier periods, promotes healthy growth. Be aware of differing needs among specific species within the iodanthus genus.