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Potamogeton crispus (Curled Pondweed)

Potamogeton crispus (Curled Pondweed)

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£6.00
£6.00 - £6.00
£6.00
Size Information

You can choose plants in various pot sizes. Non-potted plants arrive bare root for you to pot in the specified pot size.

Seasonal Information

Depending on the time of year, pond plants may be supplied fully-leaved, with flowers, or with foliage trimmed back.

Delivery Information

This plant is grown in the UK and sent directly from our tried, tested and trusted plant partner. Delivery price calculated at checkout.

Description of Potamogeton crispus (Curled Pondweed)

Potamogeton crispus, commonly known as Curled Pondweed or Curly Pondweed, is a hardy submerged aquatic perennial found in ponds, canals, and slow-moving water across the UK. It is valued for its ability to improve water quality and support wildlife.

This species produces narrow, lance-shaped to oblong leaves that grow entirely below the surface. As the plant matures, the leaf edges become strongly wavy or curled. This gives a textured appearance and helps create shelter within the water column.

Unlike many aquatic plants, Potamogeton crispus does not produce floating leaves. In summer, it forms small reddish flowers that rise slightly above the water. These are subtle but play a role in reproduction and biodiversity.

You may also see this plant sold under other names:

  • Curly pondweed
  • Water calthrops

If you want to support a stable pond, this species is a practical addition. It absorbs nutrients that would otherwise feed algae. It also releases oxygen during daylight, which benefits fish and beneficial microbes.

Think about your pond structure. Do you have enough underwater cover? Dense submerged growth helps fish hide and breed. It also provides habitat for invertebrates and amphibians.

Why grow Potamogeton crispus in your pond?

  • Native and well suited to UK climates
  • Reliable oxygenating plant
  • Helps maintain clear and balanced water
  • Provides shelter and spawning sites
  • Supports frogs, newts, and insects
  • Suitable for wildlife and natural ponds

This plant is known for strong early-season growth. It often develops before many other submerged species. This early activity helps stabilise ponds and reduces spring algae blooms.

Planting and care tips

  • Plant in still or slow-moving water
  • Suitable for depths from 20 cm to over 1 m
  • Anchor stems or rhizomes in aquatic soil or gravel
  • Allow some space for spread
  • Best introduced in spring or autumn
  • Thin if growth becomes dense

This species can form dense patches in nutrient-rich ponds. Regular thinning helps maintain open water and balance. Removed material can be composted.

Combine Curled Pondweed with floating plants and other native oxygenators such as Myriophyllum and Callitriche to create a layered habitat. This supports more wildlife and improves resilience.

If you want a dependable, low-maintenance oxygenator that works in many pond types, Potamogeton crispus is a strong choice. It supports biodiversity and helps keep your pond healthy throughout the year.

FAQs

What are the best oxygenating plants for a wildlife pond?

Good choices include submerged species such as hornwort, water starwort, water violet, water crowfoot and suitable pondweeds. The best choice depends on the pond's depth, size and conditions, so using more than one suitable species can provide useful underwater habitat as well as plant diversity.

How many oxygenating plants do I need in my pond?

As a general guide, the RHS suggests around four to five bunches of submerged oxygenators, each containing three to four stems, per square metre of water surface. Avoid excessive planting, as submerged plants also respire at night and overcrowding can cause problems.

Do oxygenating pond plants keep water clear?

Oxygenating plants can contribute to a balanced pond and compete for nutrients that might otherwise support excessive algae growth. However, they are not a guaranteed cure for green water, as water clarity is affected by factors including sunlight, nutrients, plant coverage and the overall balance of the pond.

Do oxygenating plants need to be planted in baskets?

It depends on the species. Some submerged oxygenators are rooted and can be planted or anchored in aquatic baskets, while others can grow freely in the water. Follow the planting instructions for the individual species rather than treating all oxygenators in the same way.

Do I need oxygenating plants if I have a pond pump?

A pump can circulate and aerate water, but oxygenating plants provide additional benefits such as underwater cover and habitat for pond life. For a wildlife pond, plants are therefore useful for more than simply adding oxygen to the water.

What are the best pond plants for a wildlife pond?

The best wildlife pond plants provide a mixture of underwater cover, surface shade, flowering habitat and places for aquatic insects to emerge. A balanced pond can include oxygenating plants, marginal plants and floating-leaved plants such as water lilies. Native species are particularly useful for supporting UK pond wildlife.

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