The use of shape transformers methodology, local buckling Brazier model and finite elements analysisis to model the Ravenala madagascariensis petiole allows to discover how the relation between shape and mater gives to the plant a structural support to bear high bending and torsion loads without fail. The combination of an elliptical stiff perimeter (epidermis) reinforced with a highly ordered cellular core (aerenchyma) gives to Ravenala petiole two very efficient and secure stability mechanisms.