Floating plants provide shade, filter the water, absorb extra nutrients, and look great in ponds.
Deep-water emergent plants come up from the bottom and bloom on top of the water. They provide cover, shade, and breakdown nutrients algae thrive on.
Marginal, or bog, plants have great benefits too. They collect nutrients on the sides of your pond before they can feed algae or mess with the water.
Submerged plants take care of the pond bottom. They remove nutrients, oxygenate the water, and give hiding places to fish.