Why Dieffenbachia HousePlants Get Yellow Leaves

Hi Judy,
Can you tell me what kind of plant this is and perhaps help me figure out why it is turning yellow? There is new growth, but all the larger, older leaves have turned yellow and died, now I’m losing about three leaves a day. It’s in direct light in my south-facing window.
Thank you!

Hi Rebecca,

Yellow and green Dieffenbachia Plant
Dieffenbachia HousePlant

Your plant is a very poisonousPlants are a great addition to homes and offices, but it’s important to know whether your plants are dangerous to children, pets, or even adults. Some plants contain chemicals such as oxalates, solanine, glycosides, or alkaloid lycorine that may cause vomiting, nausea, diarrhea, swelling and redness of the mouth, throat, and lips, and trouble breathing. Touching parts of certain plants, especially the sap, may cause various skin irritations. The weight and age of the human or pet involved, and the part and amount of plant eaten determine how severe the reaction to the toxins will be. Although plants may be listed as non-toxic, they can still cause individual allergic reactions. If there is any question after a houseplant has been ingested or touched, immediately call the Poison Control Center 1-800-222-1222.  More poisonous houseplant information and pictures of common plants that are dangerous to children and pets can be found in my book Don’t Feed Me to Your Cat: A Guide to Poisonous Houseplants houseplant called a Dieffenbachia. Dieffenbachia houseplants may get yellow leaves for a couple of reasons. If the temperature gets too cold or the dieffenbachia is near an air conditioner, leaves turn yellow. If the soil of a dieffenbachia gets too dry and the plant wilts, a dieffenbachia gets yellow leaves. If the bottom leaves are not getting enough light, this causes yellow leaves. You can read more of my care tips for dieffenbachia houseplants in the Popular HousePlant section of the website.