The object of this study was to provide some basic information of the optimal growing conditions for Acacia melanoxylon, Eucalyptus pauciflora, Eucalyptus viminalis and Pinus radiata and to suggest ways and means of diagnosing the morphological growth abnormalities and deficiency symptoms caused by boron nutrient. The importance of boron nutrition for A. melanoxylon, E. pauciflora and E. viminalis was confirmed. Absence of boron from mineral nutrition in Hoagland's nutrient solution in pot experiments resulted in terminal shoot-dieback in A. melanoxylon, and apical bud-dieback in E. pauciflora and E. viminalis. Injury due to insufficient boron in P. radiata developed slowly. Application of boron nutrient and increased growth increment and foliar boron levels in these species.