A study was undertaken to compare growth potential of three Eucalyptus species of natural origin in South Eastern Australia, with commercially grown species on mid and high altitude temperate sites in the summer rainfall growing zones in South Africa. The three species were Eucalyptus globulus subsp. bicostata (E. bicostata), Eucalyptus cypellocarpa and Eucalyptus nobilis. Nine sites were selected to represent the growing areas of South Africa experiencing cold winter drought with occasional snow falls. Keywords: Eucalyptus bicostata, Eucalyptus cypellocarpa, Eucalyptus nobilis, Summer rainfall region, Plant pathology, Microbiology, Genetics, Biochemistry.