Marginal aquatics are the plants found growing around the edges (margins) of a water garden. They add valuable filtration to the pond and they remove elements that would otherwise feed algae.
To create a natural-looking pond, a good selection of marginal plants is very important. There are hundreds of varieties – hardy and tropical – that come in all shapes, sizes, textures, and flower colors.
How to Plant Marginals
In a rock and gravel pond, marginal plants are generally placed directly into the gravel. This allows them to thrive naturally, and filter the water more effectively. Invasive species should be kept in pots that are buried in the rocks and gravel. Well-behaved plants can be taken out of the pots and planted directly in the gravel where the roots can absorb nutrients directly from the substrate of the pond where fish waste and other organic debris settle and begin to decompose.
Choose the area you wish to place the plant, move the gravel aside with your hands, place the plant, and spread the gravel around the base to support the plant and hide the pot. If you’re planting bare-root, remove the plant from the pot and wash away any loose soil before planting. Tropicals that you plan to bring indoors over the winter, should be left in the pots to make removal easier.