1L Water Knotweed - Persicaria amphibia

Code: PL0841
1L Water Knotweed - Persicaria amphibia
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1L Water Knotweed - Persicaria amphibia

Water Knotweed - Persicaria amphibia - 1L Pot

The Water Knotweed can be grown in a pond or in moist, damp soil such as a bog garden. It has perennial, lance shaped leaves that have a glossy shine. In summer and autumn it produces erect stems that support five petaled, pink flowers.


  • Foliage Colour: green in spring, summer and autumn
  • Flower Colour: pink in summer and autumn
  • Approx. Growth Height: 30cm
  • Max. Spread: 2m
  • Flowering Time: summer and autumn
  • Planting Time: spring/summer
  • Uses: in ponds, bog gardens, wildflower gardens
  • Exposure: exposed, sheltered
  • Growing Habit: spreading
  • Hardiness: hardy
  • Rate of Growth: max height in 2-5 years
Size Options
Supplied AsTitle Price Link
9cm Pot
£17.99View Here
1L Pot
£14.99This Product
3L Pot
£20.99 View Here


  • Light Requirements: partial shade, full sun
  • Moisture: poorly-drained or moist but well drained
  • Soil requirements: acidic, neutral, alkaline, loamy, sandy, clay


  • Planting depth: up to 45cm
This plant can be grown in either a pond or in moist, fertile soil. Grow in a pond with a depth of up to 45cm; this plant is suitable for zones 1, 2 and 3 of a pond. Aquatic and marginal plants should be placed in pond plant baskets filled with aquatic soil (sold separately) and topped with a thin layer of gravel to help prevent the soil from washing away.

Caring and Maintenance

This is a very low maintenance, hardy plant. Water adequately during dry and hot periods.

Below is a comparison of pot sizes. From left to right: 9cm Pot, 1L Pot, 3L Pot


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