Fig. 1.

A schematic showing the interactions between the eight primary fields in the model presented by ref. 1: Hormone concentration $A$ and growth $g$ vary both along and across the shoot; stretch and intrinsic curvatures $\gamma$, ${\mathsf{u}^}_1$, and ${\mathsf{u}^}_2$, realized curvatures $u_1$ and $u_2$, and the location of the shoot’s centerline in three-dimensional space $\mathbf{r}$ vary along the shoot. Interactions between these fields are described in the text as Processes i to v. The dashed arrow represents the mechanical impact of external loads (e.g., self-weight, contact with a rigid surface) in determining the shape of the plant.