Alpine knotweed Persicaria alpina

alpine knotweed


P. alpina is a tall semi-evergreen, perennial to 1.8m in height with large lance-shaped green leaves and strong stems bearing plumes of small creamy-white flowers in summer, followed by pinkish-red seed heads in late summer

Plant Info
Common Problems

About this plant

  • memoNames

    • Family


    • Synonyms

      alpine knotweed

    • Common names

      Polygonum polymorphum, Persicaria polymorpha

  • skullToxicity

    Contact with all parts may irritate skin, the sap may cause mild stomach upset if ingested. Wear gloves and other protective equipment when handling

  • infoCharacteristics

    • Foliage type


    • Height

      1.5-2.5 metres

    • Spread

      1-1.5 metres

    • Hardiness zones


  • sunLight

    Full Sun, Partial Shade

  • scissorsPruning

    Cut back after flowering

  • bambooSoil

    Loam, SoilClay

  • pinSuitable locations

    • Hardiness zone

      Low Maintenance Drought Resistant Cut Flowers Flower borders and beds Hedging & Screens Wall-side Borders City & Courtyard Gardens Cottage & Informal Garden Prairie Planting Rock Garden Gravel Garden

  • sproutPropogation

    • Propagate by division in spring or autumn or propagate by seed in spring

  • insectPests

    Generally pest free

  • microbeDiseases

    Generally disease free