Your Calathea will need very regular watering, never being allowed to dry out
They are highly susceptible to root rot, so planting in a high draining soil is essential
High humidity is essential to maintaining your tree, supplemental humidity will almost always be required- a humidity tray is the best way to do this
They need a consistently warm spot and bright
Keeping a high light level is crucial to the health of the tree, supplementing with a grow light can be necessary during the winter season
They will enjoy a spot with full sun, but ensure they are not exposed to direct afternoon light as the foliage will burn very easily