Dieffenbachia Costa Farms What is wrong with my Dieffenbachia? More and more yellow leaves appearing (I've cut some of them off already). I water it once per week. It used to sit on the window 2pcs 4pcs Heavy Duty Hanging Planters, 40.64cm Metal Rail Fence Planter Box with Detachable Hooks * Balcony, Railing & Garden Decor, Outdoor Planters * Geometric Pattern, Durable Construction, Restorers Plain Shelf Bracket Plant Hanger Van Dyke's Restorers