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Position

Sun exposure:
Full sun, partial shade
Aspect:
East facing, north facing, south facing, west facing
Position in border:
Middle

Soil

Acidic / Chalky / Alkaline / Clay / Heavy / Moist

Alpine knotweed, Persicaria alpina, is a substantial herbaceous perennial with pointed green leaves topped by fluffy flower plumes from midsummer and into autumn. Don't be put off by its common name; Persicaria alpina is easy to grow, but not thuggish or invasive, although it does resemble Japanese knotweed.

Persicaria alpina enjoys growing in moist soil, so it's a great choice for growing near ponds, allowing the water to catch its reflection.

For best results, grow Persicaria alpina in full sun or partial shade in moist, well-drained soil, sheltered from strong winds. Cut back the foliage to the base of the plant after it has been hit by the first frosts.

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Plant calendar

JanFebMarAprMayJunJulAugSepOctNovDec
Sowyesyesyes
Plantyesyesyes
Flowersyesyesyes
Divideyesyesyesyesyesyes
Cut backyesyes

Persicaria and wildlife

Persicaria has no particular known value to wildlife in the UK.

Is Persicaria poisonous?

Persicaria has no toxic effects reported.

No reported toxicity to:
Is not known to attract Birds
Birds
Is not known to attract Cats
Cats
Is not known to attract Dogs
Dogs
Is not known to attract Horses
Horses
Is not known to attract Livestock
Livestock
Is not known to attract People
People
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