Persicaria affinis

Persicaria affinis

Knotweed

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Flowers
Flowers

Plant does not flower in January

Plant does not flower in February

Plant does not flower in March

Plant does not flower in April

Plant does not flower in May

Plant does flower in June

Plant does flower in July

Plant does flower in August

Plant does not flower in September

Plant does not flower in October

Plant does not flower in November

Plant does not flower in December

  • Botanical name: Persicaria affinis
  • Common name: Knotweed
  • Family: Polygonaceae
  • Plant Type: Perennial, Evergreen
Flower colour:

Pink

Foliage colour:

Green

Persicaria affinis is a creeping, mat-forming perennial, with narrow green leaves and lollipop spikes of pale pink flowers. Semi-evergreen, it makes a fine choice for using as ground cover in a mixed herbaceous border, and its blooms are popular with pollinators. 

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Grow Persicaria affinis in full sun to partial shade, in moisture retentive soil. Cut back after flowering and divide congested clumps every three years. 

How to grow Persicaria affinis

  • Plant size

    25cm height

    75cm spread

  • Aspect

    South facing, west facing

  • Position in border

    Front

  • Sun exposure: Full sun, dappled shade, partial shade
  • Hardiness: Hardy
  • Soil type: Clay / heavy / moist

Plant calendar

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Plant
Plant

Do not Plant in January

Do not Plant in February

Do not Plant in March

Do not Plant in April

Do Plant in May

Do Plant in June

Do Plant in July

Do Plant in August

Do Plant in September

Do not Plant in October

Do not Plant in November

Do not Plant in December

Flowers
Flowers

Plant does not flower in January

Plant does not flower in February

Plant does not flower in March

Plant does not flower in April

Plant does not flower in May

Plant does flower in June

Plant does flower in July

Plant does flower in August

Plant does not flower in September

Plant does not flower in October

Plant does not flower in November

Plant does not flower in December

Divide
Divide

Do not Divide in January

Do not Divide in February

Do Divide in March

Do Divide in April

Do not Divide in May

Do not Divide in June

Do not Divide in July

Do not Divide in August

Do Divide in September

Do Divide in October

Do not Divide in November

Do not Divide in December

Prune
Prune

Do not Prune in January

Do not Prune in February

Do not Prune in March

Do not Prune in April

Do not Prune in May

Do not Prune in June

Do not Prune in July

Do not Prune in August

Do Prune in September

Do Prune in October

Do not Prune in November

Do not Prune in December

Persicaria affinis and wildlife

Persicaria affinis is known for attracting bees and other pollinators. It has nectar/pollen rich flowers.

Attractive to Bees

Does not attract Beneficial insects

Does not attract Birds

Does not attract Butterflies​/​Moths

Attractive to Other pollinators

Is Persicaria affinis poisonous?

Persicaria affinis has no toxic effects reported.

No reported toxicity to:

No reported toxicity to Birds

No reported toxicity to Cats

No reported toxicity to Dogs

No reported toxicity to Horses

No reported toxicity to Livestock

No reported toxicity to People

Plants that go well with Persicaria affinis