Water, whether too much or too little, can cause peace lilies to wilt and the leaf edges to turn yellow or brown. Daisy-like yellow flowers bloom on tall, branched stems. My Leopard Lily leaves are turning yellow!? Shock can cause leaves to yellow. Eventually, in its later stages, the disease causes plant foliage to die back. When we hear the word evergreen, we automatically think of those prickly plants, shining green amid a sea of snow. Many different problems can cause dieffenbachia leaves to turn yellow, including disease, insect infestations and cultural problems. All are doing great so far over the past three years. The dieffenbachia is beloved for its large, tropical leaves and easy adaptation to indoor environments. Exposure to direct light can cause the leaves to turn yellow; showing a burnt appearance. Plus, get steps to help treat your ailing palm tree. Dark brown spots with yellow rings are also a symptom of bacterial blight. John is right, black spots could be indicative of a fungal problem due to water standing on the leaves for too long. There are some 150 species in the genus Ligularia, most native to the Himalayan region, China and Japan. Light, water and fertilizer can all be a factor in the browning of peace lily leaves. Also have 'Crispata' and the Spotted Leopard Plant. Click to see full answer. These infections are generally the result of fungi either from decaying plant matter or from airborne spores and high humidity. Powdery mildew – Powdery mildew leaves a white powder-like coating on all parts of the plant. Herein, why is my leopard lily dying? Unless exposed to a hard freeze, the leaves will regrow in spring. 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. On trees and other woody plant life, a surefire sign of bacterial blight is an oozing wound from which sap seeps out. The Lowdown on Palm Trees with Yellow Leaves. After adjusting to its new home and roots become established, the plant should put out you, green leaves. This change is usually short-lived and goes away after the plant has properly adapted to its new environment. 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 As gardeners we are always on the lookout for that plant that will create an impact in the garden. Good ventilation and careful watering is recommended. When mass planted, leopard plants make great groundcovers for a woodland garden. 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. Growing a Leopard Plant. 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.). If Lorraine’s palm problem sounds familiar, read on to learn why palm leaves turn yellow (specifically queen or majesty palms). Tall plants with showy flowers and large leaves fit the bill quite nicely and one of the best plant group that encompasses this description are the Ligularia.. Hi Carol - I have a very nice Giant Leopard Plant (Farfugium) growing in my backyard. Allow the plant to dry out, placing in a sunny location, if necessary. Also called the dumbcane plant, the dieffenbachia is a houseplant that grows up to 6 feet tall and 3 feet wide. 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? 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