On March 28, 1979, near Harrisburg, Pennsylvania, the Three Mile Island nuclear power plant reactor's core overheated due to a cooling valve failure, releasing radioactive steam into the atmosphere. The accident raised Poncirus trifoliata (Hardy Orange, Chinese Bitter Orange, Bitter Lemon et al) is a citrus family member that is hardy to about zone 5 on the east coast. Not widely planted at all Flower Garden Reed Diffuser Plant Portrait: Spider Plants Leaf and Paw 32 Easy Houseplants Perfect For Beginners