Submergent aquatics (SA) form the foundation of a balanced aquatic ecosystem providing a vital roll in nutrient absorption, particulate filtration, and oxygenation. They function as a biological particulate & chemical filter while providing critical cover and oxygen for countless invertebrates & the predators that consume them. Often referred to as "oxygenators" most water gardeners consider them essential for a balanced ecosystem. Many native options are available that can provide interesting forms as well as function. Submergents are sold as bare root items in season. Some species may be available as "tubers" or "resting buds" for dormant plantings in cooler months.