Step 4 -  Add plants.
Complete your garden by adding plants. Basically there are four types of plants that you can use; deep water plants, bog plants, oxygenators, and floating plants. A small mix of the plants ensures a thriving self-sustaining system. Cover 60-70% of the pond surface with floating plants like water hyacinth and/or container plants with floating foliage like water lilies. Submerged or oxygenating plants are generally stocked anywhere from 1-2 bunches per square yard of pond surface.