Species and provenance trials of eucalypts planted in Northland between 1988 and 1993 included several provenances each of Eucalyptus fastigata Deane et Maiden. E. regnans F. Mueller. E. saligna Smith, E. botryoides Smith, E. grandis Hill ex Maiden, E. nitens (Deane et Maiden) Maiden, E. globulus Labill, and E. maidenii Labill. Trials were all located between Kaikohe and Dargaville (latitudes 35¦31' to 35¦48'), with two trials at Carnation Road and two at Walker Road (aged 11 and 9 years) and one of E. nitens only at Karaka Road. Trial designs were mainly 64-tree square plots with two to five replicates. Trees were assessed for breast height diameter over-bark, bole straightness, malformation, and crown health. Results were expressed as provenance and species means at each site, and also as basal area per hectare over-bark, volume per hectare under-bark, and frequencies of crop trees, mortality, and runts (suppressed sub-dominants). Eucalyptus fastigata at its single test site showed best growth and health of all species (mean annual increment (MAI) at Carnation Road averaged 52 m3/ha) but suffered some basal and upper stem forking. Eucalyptus regnans averaged 50 m3/ha/year, with good crown health, but E. nitens of central Victorian provenances showed poor crown health and high mortality despite good earlier growth. Eucalyptus saligna (and E. grandis) grew more slowly than other species and showed a high frequency of runts. Eucalyptus maidenii, planted in only one subsidiary trial at Carnation Road (and at Knudsen Road), had better crown health, higher survival, and better growth than E. saligna, E. grandis, and E. globulus, though its volume growth appeared to be less than E. fastigata in the main trial. Eucalyptus nitens of central Victorian provenances was evidently poorly adapted and unlikely to continue its earlier good growth, and even the healthier NSW provenances appeared insecure. Eucalyptus fastigata was a clear winner for growth and health, followed by E. regnans. Eucalyptus globulus had generally poor health and slower growth than E. nitens. Eucalyptus maidenii, although a slower starter, had good crown health and good survival, and showed higher wood density (from other studies) than E. nitens and E. globulus, and by inference, E. fastigata and E. regnans. Eucalyptus saligna, originally the preferred species in Northland, produced much less volume than the other species. Eucalyptus botryoides failed completely due to early possum damage.