Watercress (Nasturtium officinale, syn. Rorippa nasturtium-aquaticum)

Watercress | Nasturtium officinale, syn. Rorippa nasturtium-aquaticum

Fast growing native pond plant that naturally filters water and supports wildlife

Watercress (Nasturtium officinale, syn. Rorippa nasturtium-aquaticum), sometimes known as Watercress Nasturtium, is one of the most useful and beneficial pond plants you can add to a wildlife pond, stream, or natural water garden. This vigorous UK native aquatic plant is highly valued for its ability to absorb excess nutrients from the water, helping to improve water quality while reducing the conditions that encourage algae and blanketweed growth.

With its bright green oval leaves and spreading growth habit, Watercress quickly forms dense mats along shallow pond margins, streams, and wetland areas. These lush mats create valuable shelter for frogs, newts, insects, tadpoles, and other aquatic wildlife, making Watercress one of the best plants for enhancing pond biodiversity.

From late spring through to early autumn, Watercress produces clusters of small white four petalled flowers that attract bees, hoverflies, and other pollinating insects. The flowers add a delicate touch to the pond while contributing to the wider ecosystem of the garden.

One of the biggest advantages of Watercress is its natural filtration ability. As a fast growing marginal plant, it actively absorbs nitrates, phosphates, and excess nutrients from the water. This helps maintain clearer water and can significantly reduce the nutrient levels that fuel nuisance algae growth. For wildlife ponds and natural ponds, Watercress is often considered one of the most effective biological filter plants available.

The soft foliage also plays an important role in amphibian breeding. Newts frequently use Watercress leaves to wrap and protect their eggs, making it an excellent choice for anyone looking to create a wildlife friendly pond environment.

Watercress grows best in shallow water, pond margins, streams, and boggy conditions where it can access a constant supply of moisture. It performs well in both full sun and partial shade and is exceptionally hardy throughout the UK, surviving even severe winter conditions.

Due to its vigorous growth, regular trimming is recommended to keep it neat and prevent it from spreading too aggressively. Keeping Watercress planted within an aquatic basket helps maintain control while still allowing it to provide all of its natural filtration and wildlife benefits.

Whether you are creating a wildlife pond, natural swimming pond, stream, or ornamental water feature, Watercress is one of the most practical and environmentally beneficial aquatic plants available.

🇬🇧 UK-grown aquatic plant: Grown at a dedicated aquatic plant nursery in the South of England and carefully prepared for delivery across the UK.

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Key Benefits

• Excellent natural water filtering plant
• Helps reduce excess nutrients that encourage algae growth
• Supports frogs, newts, tadpoles, and aquatic wildlife
• Provides egg laying habitat for newts
• Attractive white flowers from spring to autumn
• Fast growing and easy to establish
• UK native pond plant
• Suitable for wildlife ponds and streams
• Helps improve pond biodiversity
• Hardy throughout the UK

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Reasons to Buy

• One of the best pond plants for natural filtration
• Helps maintain healthier pond water
• Ideal for wildlife friendly ponds
• Attractive foliage and flowers throughout the season
• Easy to grow in shallow water and wet soils
• Excellent for natural pond landscaping

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Care Instructions

• Watercress thrives in shallow water, pond margins, streams, and wet boggy areas. Position the plant so the crown sits between 0 cm and 10 cm below the water surface.
• For best results, place Watercress in an aquatic basket to help manage its vigorous spread. It grows well in full sun or partial shade and benefits from regular access to fresh, oxygenated water.
• Trim the foliage regularly throughout the growing season to maintain its shape, encourage fresh growth, and maximise its nutrient absorbing capabilities.
• Divide large clumps when necessary to prevent overcrowding and maintain healthy growth.

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Flowering Period

May to September

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Size and Growing Conditions

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Dispatching Your Pond Plants

Your Watercress will be carefully packed to protect the foliage and roots during transit.

Orders received by 11am Monday to Wednesday are normally dispatched on the following working day using a next working day courier service. During busy periods, dispatch may occasionally take an extra day.

To avoid plants being held in depots over a weekend, we do not usually dispatch on Fridays. Highlands and Islands orders using a two day service are not normally dispatched on Thursdays.

Available basket sizes:

• Pack of 3 × 9cm Pots
• 1 Litre Basket – usually 11 × 11 × 11cm square; some varieties may be supplied in a 14cm diameter × 10cm round basket
• Pack of 3 × 1 Litre Baskets – each usually 11 × 11 × 11cm square

Planting depth is measured from the top of the aquatic basket to the water surface.

Plants supplied in 9cm pots require potting into suitable aquatic baskets before being placed in the pond.

Finofil baskets are manufactured in the UK from 100% recycled plastic and are fully recyclable. Their fine dual-mesh construction helps retain aquatic soil while allowing water and nutrients to reach the roots. Basket shape may vary slightly depending on the plant and supplier availability.

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Similar pond plants

For another pond-edge planting option, compare Branched Bur-reed (Sparganium erectum) and White Chinese Marshflower (Mazus reptans ‘Albus’).

Explore more marginal pond plants or browse our complete pond plants range. Need baskets, aquatic soil or planting essentials? Browse our pond plant baskets and aquatic planting supplies.