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Knotweed in the GardenTags plant encyclopedia

Persicaria bistorta subsp. carnea

 

Knotweed

Persicaria are commonly known as knotweeds or smartweeds. Flowers in shades of pink or white appear late in the season on these hardy, herbaceous perennials. They are easy to grow and ideal for boerders or as ground cover. The best flower and leaf colour is achieved when grown in full sun. Persicaria bistorta subsp. carnea is a more compact bistorta cultivar and has spikes of soft pink flowers over an extended period.

Contributed by @Andreamarie

 
plant Features
  • Knotweed likes full sun to partial shade

    Full sun to partial shade

  • Knotweed likes occasional watering

    Occasional watering

  • Knotweed is full frost hardy: 5f (-15°c)

    Full Frost Hardy: 5F (-15°C)

  • Knotweed likes moist and free draining

    Moist and free draining

 
plant information

Common name

Knotweed

Latin name

Persicaria bistorta subsp. carnea

type

Herbaceous Perennials

family

Polygonaceae

ph

5.0 - 8.5 Acid - Neutral

  • Light

    Knotweed likes full sun to partial shade

    Full sun to partial shade

  • Frost

    Knotweed is full frost hardy: 5f (-15°c)

    Full Frost Hardy: 5F (-15°C)

  • Soil

    Knotweed likes moist and free draining

    Moist and free draining

  • Water

    Knotweed likes occasional watering

    Occasional watering

Plant & bloom calendar

  •  
    Best time to plant
  •  
    When the plant will bloom

full grown dimensions

The size of a fully grown Knotweed is 0.45meters x 0.45meters 0.45 M 0.45 M

Persicaria bistorta subsp. carnea

Persicaria are commonly known as knotweeds or smartweeds. Flowers in shades of pink or white appear late in the season on these hardy, herbaceous perennials. They are easy to grow and ideal for boerders or as ground cover. The best flower and leaf colour is achieved when grown in full sun. Persicaria bistorta subsp. carnea is a more compact bistorta cultivar and has spikes of soft pink flowers over an extended period.


Flowering

From Mid Summer TO Late Autumn

Most species of Persicaria are in flower through the summer months between mid summer and late autumn.

 

Planting Outdoors spring

From Early Spring TO Mid Spring

Plant out in the garden in full sun or partial shade. Whilst they prefer moist soil most will tolerate dry conditions but won't spread so much.

 

Planting Outdoors autumn

From Mid Autumn TO Late Autumn

Plant out in the garden in full sun or partial shade. Whilst they prefer moist soil most will tolerate dry conditions but won't spread so much.

 

Propagation by Division

From Late Autumn TO Late Autumn

Propagate by division. Dig up and replant healthy sections every 2 or 3 years to keep in check and avoid the centres of clumps dying out.

 
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