Light Another false belief about Dieffenbachia's is that they need very little light. This is actually wrong, light shade is acceptable but nothing darker. To maintain a healthy plant you should be giving indirect bright light. Keep it away from direct sunlight during the middle of the day and early afternoon when the suns is at its hottest. If the light levels are too bright however the leaves will scorch, too dark and you will be left with a leggy and sickly looking plant. Find the balance that works for your plant and stick with it. Watering They like a really good watering then to be left alone to dry out for a bit. This is one houseplant which probably wont mind a routine watering regime. Of course always adjust according to the season and to the needs of your own Dumb Cane, for example expect in very warm months to water more often and in Winter less regularly. Humidity Many books and websites recommend high humidity. It may be down to the cultivars we grow personally (D. picta "Camilla", D. picta "Exotica" and D. amoena "Tropic Snow") but in our experience the plant rarely suffers if humidity is low. Red Spider Mite can be a problem in such situations though. Feeding Feed in the growing season at half strength every month or so.