Amazon.com : Preen Garden Weed Preventer 13 lb. Covers 2,080 sq. ft. : Weed Killers : Patio, Lawn & Garden 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 Red Chinese Evergreen Hey Rooted The Socotra Dragon Blood Tree (Dracaena Cinnabari) is an endemic and endangered tree from Socotra island of Yemen. Not to be confused with the Dracaena Draco that grows in the Canaries Islands.