Uptake of mineral nutrients by the leaves Waxes represents the water proofing component of the cuticle. Due to their hydrophobic nature waxes impede the diffusion of hydrophilic ions. So the leaves are not constructed for the uptake of hydrophilic ions dissolved in water. Nevertheless uptake of aqueous plant nutrients at least in small quantitiesWaxes represents the water proofing component of the cuticle. Due to their hydrophobic nature waxes impede the diffusion of hydrophilic ions. So the leaves are not constructed for the uptake of hydrophilic ions dissolved in water. Nevertheless uptake of aqueous plant nutrients at least in small quantities. Uptake of mineral nutrients by the leaves