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Dieffenbachia plants are popular indoor plants largely because they do well in shady conditions, but these plants do appreciate bright light during the winter months. During the growing season, the plant prefers dappled shade or indirect light. The plant will favor the side facing the light, so periodically rotate the plant to keep its growth balanced.
Use a fast-draining, well-aerated potting mix. Make sure drainage is good to avoid damaging the roots; they should never be left in soggy soil.
During the growing season, dieffenbachias like regular moisture and do not want to dry out. A large dieffenbachia might need to be watered twice a week. In the winter, you can cut back on the water. At the same time, it’s important not to overwater a dieffenbachia, which can cause rot problems. Make sure the top of the soil is fully dried out before watering.
Temperature and Humidity
This plant likes fairly warm conditions, from 65 degrees to 75 degrees Fahrenheit. If the temperature drops below 60 degrees or if the plant is exposed to cold drafts, it is likely to lose lower leaves and assume a palm-like appearance.
For best results, feed regularly (every four to six weeks) with a balanced, diluted fertilizer, such as a 20-20-20. For the amount to use, follow product label instructions. However, some growers swear by a routine of using a weak diluted fertilizer at every watering.