So, between the banana trees and the Caribbean we've planted two rows of sugar cane. The thin leaves of the cane don't seem to suffer as much from the salty breeze and when fully mature the plants are almost as tall as the banana trees so we're hoping for protection for the banana trees as well as for the garden.
Cut some stalks of sugar cane. Strip the leaves off and slice the stalks into pieces about eighteen inches long. Drop these pieces into a shallow trench, or in our case two shallow trenches.