(a) Drawings of the orientation of the axes of individual nodes of a typical 21‐d‐old Tradescantia cutting grown under different light regimes. Node 1 is the oldest and is the anchoring point for each cutting. Node 3 for which data are presented is shown shaded. (b) The GSA of node 3 of Tradescantia cuttings is dependent on the fluence rate of white light. The data shown are for node 3 of individual plants that most closely matched the median value of the population on day 21. The LSD value shown applies to the means of the population on day 21 where ANOVA showed that there was a highly significant effect of light (P<0.001).