For the gannas genus, optimal growth requires well-draining soil, abundant light, and moderate water. Begin by enriching the planting area with organic matter to improve drainage if necessary, and position the plants where they'll receive full sun. Ideal planting depth varies, so consider the size of the particular species. Initial watering should establish roots without causing waterlogging. Mulch may help retain soil moisture. Recognize that individual gannas species might have unique requirements, and adjusting practices accordingly will enhance success.