It has thin roots, so it can't tolerate wet soil for too long, but it also doesn't store a lot of moisture by itself. This is why you should water your Dieffenbachia regularly, but not too often. Once per week or once every two weeks is usually the right time to water your plant
Dieffenbachias are considered heavy feeders. As a general guide, use a complete fertilizer such as 20-20-20 and feed every 4-6 weeks only during the active growing season. Maintain moderately moist soil. Watering is an important part of growing dieffenbachia.
Your Dieffenbachia will do best in bright, indirect light. It can also tolerate lower light environments, though growth will slow. Avoid direct sunlight which can burn the leaves. Water your Dieffenbachia when the soil volume is 50-75% dry.
A chilling temperature is any temperature that is cold enough to cause plant injury but not cold enough to freeze the plant. These temperatures usually range from just above 32°F to about 59°F.
Upon purchasing, if the pot is too small, proceed to repot so that the plant may grow adequately. After that, every 2 or 3 years and preferably in spring, repot your dieffenbachia in a pot of a slightly larger size. The roots hate excess water.