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Commonly known as (Polygonum) - Knotweed

Genus of about 150 annuals and perennials. They may be evergreen, semi-evergreen or deciduous and many spread by stolons leading to a spreading habit which can be invasive. This habit and their commonly used name knotweed can give cause for concern but used wisely they are worthy performers. They are found in a variety of habitats worldwide and most have long-lasting spikes of flowers followed by distinctive 3-angled or ovoid fruits.

  • Deciduous
  • Evergreen
  • Semi-evergreen - Keeps some of its foliage all year, and will drop some leaves as well.
  • Red
  • Shades of pink - All shades of pink through to Carmine (red)
  • White
  • Full sun
  • Partial shade
  • May cause skin allergy or irritant - Having skin or eye contact with these plants could result in an allergic reaction, burning or rash.
  • Additional Features - Good to know - - poker type flowers. Some have attractive autumn colour. Some are invasive. Wildlife plant - insects.
  • Pests & Diseases - generally trouble-free.
  • Place of origin - various habitats around the world.
  • Resistant to honey fungus - These plants have little or few problems with honey fungus.
  • Soil Conditions - Fertile moist well-drained soil - - will tolerate any moist soil

Buy Varieties of PERSICARIA


PERSICARIA affinis  >

Commonly known as: Knotweed, Polygonum.
Deep pink
individually £10.50 each, 3+ £8.00 each

PERSICARIA affinis 'Darjeeling Red'  AWARD

PERSICARIA affinis 'Darjeeling Red'  >

Commonly known as: Knotweed, Polygonum.
Excellent ground cover with bright crimson flowers
individually £10.50 each, 3+ £8.00 each


PERSICARIA alpina  >

Commonly known as: Alpine knotweed.
(syn. P. polymorpha) - tall growing with tall stems or plumes of creamy-white flowers
individually £11.50 each, 3+ £9.00 each

PERSICARIA amplexicaulis 'Blackfield'

PERSICARIA amplexicaulis 'Blackfield'  >

Commonly known as: Knotweed, Polygonum.
Slender flowers in deep red-black. A smouldering beauty
individually £12.50 each, 3+ £10.00 each

PERSICARIA bistorta 'Superba'   AWARD

PERSICARIA bistorta 'Superba'  >

Commonly known as: Adderwort, Bistort, Polygonum.
Clear pink poker flowers
individually £11.50 each, 3+ £9.00 each
Available from July 2020 -

PERSICARIA microcephala 'Red Dragon'

PERSICARIA microcephala 'Red Dragon'  >

Commonly known as: Bistort, Knotweed.
Tall and spreading variety with dramatic brownish-red leaves with black markings
individually £12.50 each, 3+ £10.00 each

PERSICARIA 'Silver Dragon'

PERSICARIA 'Silver Dragon'  >

Commonly known as: Knotweed.
Silvery-green pointed leaves which are darker on the edge and veined with red
individually £12.50 each, 3+ £10.00 each

PERSICARIA vaccinifolia   AWARD

PERSICARIA vaccinifolia  >

Commonly known as: Knotweed, Polygonum.
Tiny pink flowers, good ground cover, and excellent autumn colour
individually £10.50 each, 3+ £8.00 each

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