The cuticle is a waxy covering on the leaves of plants. It is produced by the upper epidermis, which is like the skin of a leaf. Its function is to protect the leaf from wate … r loss through evaporation.Hope this helps!5 people found this useful.he cuticle is a waxy covering on the leaves of plants. It is produced by the upper epidermis, which is like the skin of a leaf. Its function is to protect the leaf from wate … r loss through evaporation. Hope this helps! 5 people found this useful.