Data is presented on the spatial distributions of different fuels, plant architecture and post-fire seedling recruitment and survivorship of Trioda scariosa, obtained during field studies on contrasting mallee sites in western New South Wales. In addition, rainfall data extended over c. 100 years were used in a water balance study at 1 mallee site (Pooncarie); while similar rainfall data were analysed for 3 mallee sites (Pooncarie, Ivanhoe and Mount Hope) using a filter technique to examine quasi-periodicities of rainfall and potential correlations with known wildfire seasons in the past. Precipitation records were analysed as well. All data sets exhibited strong coherence and the resulting filter curves resembled each other closely, with peaks reflecting 'above-average rainfall' and troughs 'below-average rainfall or drought' - the latter often being associated with El Nino-Southern Oscillation events. The management implications of these phenomena, particularly as they relate to major drought events, are discussed in the context of vegetation manipulation based on prescribed fire.