This study identifies and characterizes two receptor-like proteins, RLP4 and RLP4-L1, which are localized to cell edges in *Arabidopsis thaliana*. These proteins associate with the cell wall via their extracellular domains and respond to changes in cell wall mechanics. The abundance of RLP4s at the cell surface is regulated through endocytosis, allowing rapid responses to mechanical stimuli. RLP4s contribute to directional growth control in lateral roots by organizing edge-directed intracellular transport. The authors propose a model where RLP4s act as a self-regulating module at cell edges, integrating cell wall mechanical status into growth control. This mechanism ensures that growth at adjacent cell faces is synchronized, maintaining tissue integrity. The findings highlight the importance of cell edges in plant growth regulation and suggest parallels with growth control mechanisms in multicellular organisms.This study identifies and characterizes two receptor-like proteins, RLP4 and RLP4-L1, which are localized to cell edges in *Arabidopsis thaliana*. These proteins associate with the cell wall via their extracellular domains and respond to changes in cell wall mechanics. The abundance of RLP4s at the cell surface is regulated through endocytosis, allowing rapid responses to mechanical stimuli. RLP4s contribute to directional growth control in lateral roots by organizing edge-directed intracellular transport. The authors propose a model where RLP4s act as a self-regulating module at cell edges, integrating cell wall mechanical status into growth control. This mechanism ensures that growth at adjacent cell faces is synchronized, maintaining tissue integrity. The findings highlight the importance of cell edges in plant growth regulation and suggest parallels with growth control mechanisms in multicellular organisms.