The effects of four nitrogen (N) application rates (5, 10, 20, 40 g N/m2) and four potassium (K) soil levels (0.4, 0.8, 1.8, 3.2 me/100 g) on soil‐grownSandersonia aurantiaca(Hook.) stem and tuber production were evaluated. Leaf concentrations of N and K declined with plant age but were greater at the higher N and K levels, respectively. Small increases in some stem production indices (flower number, percentage side laterals) occurred with increasing N but declined with increasing K (stem length). Tuber weights declined with increasing levels of N and K with the largest tubers, 7.9 g produced at 10 g/m2N and 1.8 me/100 g K. This study indicates that moderate N and K nutrition rates should be used for soil‐grown sandersonia to optimise both stem production and tuber weights.