It can spread by self seeding but is generally well behaved compared to other knotweeds.

Does it need full sun?

No, it prefers partial to full shade to keep its leaves from scorching.

Plant guide

Jumpseed.

Persicaria virginiana

Pronounced per-si-KAIR-ee-uh ver-jin-ee-AY-nuh

Also known as American jumpseed, Virginia knotweed, Virginia smartweed, jumpseed

American jumpseed — Photo by Emily Summerbell (CC BY) via iNaturalist

Jumpseed is a charming woodland perennial that adds a soft, natural feel to shaded garden beds. It is known for its slender spikes of tiny flowers that bloom in late summer. You will love how it brings a touch of the forest floor right to your home landscape.

Another photo of Jumpseed — Photo by Curtis Burke (CC BY) via gbif

At a glance

Care level: Easy
Plant type: Perennial
Light: Partial shade to full shade
Indoor light: Medium light
Water: Every 3 to 7 days
Mature size: 2 to 3 feet
Growth rate: Medium
Hardiness: USDA 4 to 9
Bloom time: Late summer to early autumn

Care

Keep the soil consistently moist to mimic its natural woodland home. Watch for wilting leaves, which signal that the plant needs a drink. It is quite hardy and generally stays happy with minimal fuss.

Watering: Keep the soil evenly moist but not waterlogged.
Feeding: Apply a balanced organic fertilizer during the active growing season.
Pruning: Cut back the dead foliage in late winter or early spring.
Repotting: Repot only when the plant becomes root bound or needs a larger container.
Soil: Rich, moist, well draining soil
Soil pH: 6.0 to 7.0
Temperature: -20 to 30°C
Humidity: 40 to 70%
Drought tolerance: Low
Lifespan: Perennial, typically 5 to 10 years
Deer and rabbits: Moderate

Signs it needs repotting

Roots growing out of drainage holes
Water running straight through the pot
Stunted growth

Safety

People: There are no reports of significant toxicity to humans.
Children: The plant is not known to be dangerous to children, but ingestion of any non food plant should be discouraged.
Contact allergens: The sap may cause mild skin irritation in sensitive individuals.
Airborne allergens: Pollen is generally not considered a significant allergen.
Edibility: This plant is not considered edible and should be avoided for consumption.

How to identify it

Slender spikes of small white flowers
Broad, ovate leaves with dark markings
Stems that grow in a zigzag pattern
Seeds that eject when touched

Height: 0.6 to 1m
Spread: 0.45 to 0.9m
Leaves: green, burgundy, deciduous
Flowers: white, red, 0.5 to 1cm
Fruit: brown, Autumn

Problems to watch for

By symptom

Plant problems by symptom

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Growing it

Propagation: division, seed
When to plant: spring, autumn
Overwintering: Cut the foliage back to the ground after the first hard frost. Apply a light layer of mulch to protect the crown in colder regions.
In containers: It grows well in large containers that can retain moisture.

Division

Dig up the clump in early spring.
Separate the root mass into smaller sections.
Replant immediately in moist soil.

Pair this with other moisture loving shade plants to create a lush, low maintenance woodland display.

Grows well with

Hostas · They share similar shade and moisture requirements.
Ferns · The textures contrast beautifully in a woodland setting.

Similar species

Japanese Knotweed · They are related but the Japanese species is highly invasive.

Science

Family: Polygonaceae
Genus: Persicaria
Order: Caryophyllales
Class: Magnoliopsida
Native range: Eastern and central North America.
Conservation: This species is widespread and not of conservation concern.

It grows naturally in moist, shaded woodland habitats where it competes for light under the canopy.

Value to wildlife: nectar source
Pollinators: bees, butterflies
Uses: woodland gardens, shade borders, ground cover

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 6/9
Light: 3/9
Temperature: 5/9
Moisture: 7/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Is it invasive?: It can spread by self seeding but is generally well behaved compared to other knotweeds.
Does it need full sun?: No, it prefers partial to full shade to keep its leaves from scorching.

Where the name comes from

The genus name Persicaria refers to the peach like leaves, while the specific epithet virginiana indicates its discovery in Virginia.

Good to know

It is commonly known as jumpseed because the seeds are ejected forcefully when touched.
The variegated cultivars like Painter's Palette are very popular for brightening dark corners.
It thrives in moist soil and can tolerate some standing water.

Also in

Plants for shade

Keep your jumpseed growing

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.