Water Plants

By Rupert Foxton-Smythe

water plants

Discover how adding floating and marginal aquatic plants can enhance the beauty and health of your garden's water features.

TL;DR

Water plants greatly enhance any expanse of water in a garden.

  • Plants add to a pond's decorative appeal and create a healthy environment for fish.
  • Aquatic plants are divided into four groups: marginals, deep-water plants, waterlilies, and floaters.
  • Marginals grow with roots below water level and leaves above. Deep-water plants are planted at greater water depth. Waterlilies provide shade and have bold leaves and flowers. Floaters obtain nourishment from the water.

Any expanse of water in a garden, however small, is greatly enhanced by a good selection of floating and marginal aquatic plants.

Plants add greatly to a pond’s decorative appeal and help create a healthy environment for fish. Aquatic plants are divided into four groups:

Marginals such as sweet flag grow with their roots below water level and their leaves above. They usually start growing in spring, provide a spectacular display in summer, and die back in autumn. Deep-water plants such as Cape pondweed are planted at a greater water depth. Their leaves usually float on the water surface.

Waterlilies are by far the most popular deep-water plants, and there are miniature varieties for shallow ponds. They are useful for shading the water, and their bold rounded leaves and perfectly formed flowers are one of the great joys of the water garden. Floaters such as water soldier float in the water, from which their trailing roots and foliage obtain nourishment. They have an important role to play. In a healthy pond, at least 60 per cent of the water surface should be covered with foliage in the growing season, to provide shade for aquatic wildlife and fish, and to discourage algae. Submerged plants (or oxygenators) such as hornwort grow beneath the surface of the water. They help to keep the water clear and provide food and cover for fish.

Aquatics can either be bought in containers or as bare-root plants. Container-grown specimens can go in at any time of year, but bare-root plants should only be put in during spring – at the beginning of the growing season.

Plant aquatics in a special crate or basket and lower this into position; use loamy soil or special aquatic potting compost, topped with a layer of shingle. Throw floaters straight into the water.

After planting, lift, divide and replant aquatics every few years, and fish floaters out with a net to thin out.

Aquatics are not very disease prone and, if you keep fish, pests should not present a problem.

Waterlily aphids sometimes attack the leaves. Wipe them off by hand or spray them with a garden hose – don’t use insecticides.

Any expanse of water in a garden, however small, is greatly enhanced by a good selection of floating and marginal aquatic plants.

More Information on Water plants

Water plants play a crucial role in enhancing the beauty and health of any water feature in a garden. Beyond their decorative appeal, these plants create a thriving environment for fish and other aquatic wildlife. Understanding the different types of aquatic plants can help in designing a well-balanced water garden. Marginal plants, such as sweet flag, grow with their roots submerged below the water level and their leaves above. They provide a stunning display during the summer months and gracefully recede during autumn. Deep-water plants, like Cape pondweed, are planted at greater depths with their leaves floating on the water's surface. One of the most beloved types of aquatic plants is the waterlily. Not only do they offer shade to the water, but their vibrant rounded leaves and exquisite flowers bring joy to any water garden. It's worth noting that there are miniature waterlily varieties available for shallow ponds, allowing even small water features to enjoy their beauty. Floaters, such as water soldier, contribute to the overall health of a pond by obtaining nourishment from the water. They play a vital role in maintaining a healthy ecosystem, as at least 60% of the water surface should be covered with foliage during the growing season. This foliage provides shade for aquatic wildlife, fish, and discourages the growth of algae. Submerged plants, also known as oxygenators, like hornwort, grow beneath the water's surface. They assist in keeping the water clear by absorbing excess nutrients and provide essential food and cover for fish. When planting aquatic plants, it's important to consider their specific requirements. They can be purchased in containers or as bare-root plants. Container-grown specimens can be planted at any time, while bare-root plants should be introduced during spring, at the beginning of the growing season. To maintain a thriving water garden, regularly lift, divide, and replant the aquatics every few years. Additionally, thin out floaters using a net. Aquatic plants are generally not prone to diseases, and if fish are present, pests are typically not a concern. Expanding upon this topic, it is fascinating to note that some waterlilies bloom at night, releasing a delightful fragrance that attracts nocturnal pollinators. Furthermore, certain floating plants, like the water hyacinth, have the remarkable ability to absorb excess nutrients, aiding in water purification. By incorporating a diverse selection of aquatic plants, a water garden can become a vibrant and balanced ecosystem, offering both visual delight and environmental benefits.

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About the author

Rupert Foxton-Smythe

Rupert Foxton-Smythe is a seasoned horticulturist and avid plant enthusiast with over three decades of experience in the field of botany. As a leading expert at Houseplant Guru, Rupert brings a wealth of knowledge and a deep passion for all things green.

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