The Kerala Forest Research Institute(KFRI) here is planning to register with the National Bureau of Plant Genetic Resources (NBPGR) 15 "very good" clones of eucalyptus it has developed through a five-year research project. The new clones are expected to solve a significant paradox in the plantation sector in the State - that eucalyptus, introduced for its 'fast-growing' quality, has seldom grown up to deliver the promises.