Most of the time, you can easily tell what’s wrong and fix it before things get worse but sometimes, it is harder to tell where the problem lies. Aging is a natural part of plant growth. Dieffenbachia Plant Care How To Care For A Dumb Cane Plant - Youtube Plant Care Plants Dumb Cane Plant Plus, you can use these stem cuttings to propagate! Dieffenbachia plant care yellow leaves . Next, make sure the plant is getting bright, indirect sunlight and the temperature is above 59 degrees f (15 degrees c). You can place your plants atop a tray filled with water and pebbles, or use a humidifier. This is most likely to happen when the plant is moved from a higher humidity location to a lower humidity location and the plant has to make a rapid adjustment to the new growing conditions. So let's dive right in and let's help your plant. If the bottom leaves are not getting enough light, this causes yellow leaves. If you notice the leaves on your dieffenbachia turning yellow and...