Prefer warmth and no temps below 60F. high humidity is essential. Enclose in plastic bag and keep warm in bright filtered light. Treat as above. Dieffenbachias can also be air layered. The sap is poisonous.
Ferns prefer a bright or east window.
Avoid direct sunlight and drafts. The warmer the temp, the more humidity the plant should receive. Spraying should be done with tepid water since some varieties may become marked or spotted. The amount of moisture lost through the fronds of a fern is remarkable. Thoroughly soak root ball, but drain excess water.