I would look at hardy ornamental water lilies to block sunlight and compete with the submerged plants, eat up nutrients, and add beauty. I would also init ally protect them from herbivorous with a perimeter fence. This works for me. This pond has an agricultural field as most of the watershed.
RAH, I love the lillies! Do you know what other emergent plants you show there? I am looking to add something to compete with my FA for nutrients that won't get too out of control..
