Parrot’s feather is a versatile plant that you can grow underwater (to add oxygen, give fish a place to hide, and cut down on algae in ponds), floating above the water, or in wet soil at water’s edge. It earned its moniker from its dense plumes of fine-texture foliage. The feathery branches grow at the tops of long, floating stems. Parrot’s feather is considered an invasive plant in the waterways of temperate states, where its growth can quickly become out of control.