Marginal pond plants as the name suggests these plants grow along the poolside usually in aquatic planting baskets. These plants provide splashes of colour throughout the growing season. Certain plants, such as Veronica Becca bunga, will raft across the water offering shade for the fish,reducing sunlight levels and thus hindering the growth of algae. Many of the grasses are especially useful for removing excess nutrients from the water and have a wide range of variegated foliage to give colour throughout the season. Some plants, such as Caltha Palustris are ideal for an early display of colour. There are also excellent spreading plants such as Mimulus, which will quickly fill the top of a basket, making it a suitable companion for a tall plant, such as an attractive iris.