How does the surface finish of concrete affect the adhesion of climbing plants?

The adhesion of climbing plants to concrete surfaces is significantly influenced by the texture and finish of the concrete. Rough or porous surfaces, such as exposed aggregate or bush-hammered finishes, provide better grip for climbing plants like ivy and Virginia creeper. These plants use aerial rootlets or tendrils to anchor themselves, and uneven surfaces enhance mechanical interlocking.

Smooth finishes, such as polished or troweled concrete, offer less friction and fewer micro-crevices for plant attachment, making it harder for climbers to establish a strong hold. Additionally, surface treatments like sealants can further reduce adhesion by blocking pores. Understanding these factors is crucial for landscape design, where controlled plant growth on structures is desired. Proper surface selection can either encourage or discourage climbing plants based on aesthetic or structural needs.