If 1 µm NAA was supplied both apically and basally simultaneously, the mean duration of inhibition, compared to apical NAA alone, was increased from 5 days to 7–8 days. NAA at a concentration of 10 µm supplied to both ends completely inhibited all outgrowth of the lateral shoots for the duration of the experiment (14 days). However, supplying 0.5 µm NAA at both ends resulted in bud outgrowth that was not significantly different from when 0.5 µm NAA was supplied only to the apical end (data not shown).