When a plant is grown in high-humidity and then moved to a person’s home or office where there is less humidity, the change can affect the plant and make its leaves turn yellow. Good ventilation and careful watering is recommended. Eventually, in its later stages, the disease causes plant foliage to die back. Thick leaves reach up to 18 inches across and provide an interesting display when massed under trees, in a shady border or Giant Leopard Plant Also have 'Crispata' and the Spotted Leopard Plant. All are doing great so far over the past three years. Powdery mildew – Powdery mildew leaves a white powder-like coating on all parts of the plant. Also called the dumbcane plant, the dieffenbachia is a houseplant that grows up to 6 feet tall and 3 feet wide. When mass planted, leopard plants make great groundcovers for a woodland garden. Allow the plant to dry out, placing in a sunny location, if necessary. Growing a Leopard Plant. Many different problems can cause dieffenbachia leaves to turn yellow, including disease, insect infestations and cultural problems. Another sign of the disease is black marks on twigs or branches. If you disturb the root ball by digging and moving the plant abruptly from one setting to another, expect the leaves to turn yellow and even fall off. If Lorraine’s palm problem sounds familiar, read on to learn why palm leaves turn yellow (specifically queen or majesty palms). Hi Carol - I have a very nice Giant Leopard Plant (Farfugium) growing in my backyard. Unless exposed to a hard freeze, the leaves will regrow in spring. Light, water and fertilizer can all be a factor in the browning of peace lily leaves. On trees and other woody plant life, a surefire sign of bacterial blight is an oozing wound from which sap seeps out. Leopard plant is evergreen in USDA plant hardiness zones 7 through 10, but the plant dies down if temperatures drop below 30 F. (-1 C.). These infections are generally the result of fungi either from decaying plant matter or from airborne spores and high humidity. The Lowdown on Palm Trees with Yellow Leaves. Shock can cause leaves to yellow. There are some 150 species in the genus Ligularia, most native to the Himalayan region, China and Japan. Daisy-like yellow flowers bloom on tall, branched stems. When we hear the word evergreen, we automatically think of those prickly plants, shining green amid a sea of snow. The dieffenbachia is beloved for its large, tropical leaves and easy adaptation to indoor environments. Plus, get steps to help treat your ailing palm tree. I’m pretty new to keeping houseplants and thought I was doing all the right things but he doesn’t seem happy.. any help/ advice please? Dark brown spots with yellow rings are also a symptom of bacterial blight. After adjusting to its new home and roots become established, the plant should put out you, green leaves. 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