RESULTS AND DISCUSSION Mutation breeding programme for the ornamental plants at Nuclear Malaysia was initially aimed at improving plant and flower characteristics, which were very difficult to achieve through conventional breeding. Characters of interest for improvement were new flower/leaf colours and morphology using acute gamma radiation. The first batch of ornamental mutant varieties was officially launched in 2000 by Tun Dr. Siti Hasmah Mohd Ali, during Nuclear Malaysia Flora Day. Since then, newly developed mutants, either of ornamental or food crops, were launched almost everyyear during the same or similar events. Details on the characteristics of the new ornamental mutants are shown in Table 1. In addition to ornamental plants, Nuclear Malaysia has also released mutant varieties of food and industrial crops through gamma irradiation, such as bananas, in collaboration with International Atomic Energy Agency or IAEA (1994), groundnut (2002) and signal grass, in collaboration with Veterinary Institute, Kluang, Johor, Malaysia (2003)