• Photo of Persicaria pensylvanica (Persicaria pensylvanicas)

Plant Profile: Persicaria pensylvanica

Taxonomy: Persicaria pensylvanica

Names

Pennsylvania Smartweed, Pink Knotweed, Pink Smartweed

  • Photo of Persicaria pensylvanica (Persicaria pensylvanicas)

Phonetic Spelling:per-sih-KAR-ee-uh pen-sill-VAN-ee-ka

Genus:Persicaria

Species:pensylvanica

Family:Polygonaceae

Pennsylvania smartweed is a wildflower that thrives in a diverse range of moist, open environments, including fields, ditches, roadsides, swamps, prairies, fence lines, marsh edges, lakes, ponds, and even abandoned parking lots. It flourishes best in dark, loamy, and damp soils.

A variety of insects, such as bees, butterflies, moths, wasps, flies, and beetles, are attracted to this plant for its nectar. Additionally, birds like cardinals, geese, mallards, and sparrows consume its seeds. These seeds are not fully digestible, which aids in their dispersal through bird droppings. They are small, shiny, and flattened, resembling almost round shapes.

Pennsylvania smartweed is hermaphroditic, possessing both male and female reproductive organs. Its flowers are predominantly pink, though they can also appear in vibrant shades of pink and white.

This wildflower is native to the contiguous United States, with the exception of a few states in the northwest.

Persicaria pensylvanica Feature Summary

Persicaria pensylvanica Image Gallery

Tags

#drought tolerant
#weed
#wildlife plant
#herb garden
#NC native
#native garden
#wildflower garden

Similar Plants

Persicaria pensylvanica Feature Summary

Attributes
North America, Cuba to Hispaniola
Seeds are eaten by songbirds and waterfowl. Also used for nesting.
Wildlife Food Source
Wildlife Nesting
low flammability
Flowers
1" to 2" dense spike of small rose-pink flowers
Pink
Red/Burgundy
4-5 petals/rays
1-3 inches
Leaves
4" to 6" shiny leaves, sheaths without fringes, reddish joints. Some plants have small, wicked barbs on slender stems, thickened at the nodes. Tiny hairs on the margins.
Lanceolate
> 6 inches
1-3 inches
Stem
Upright, sticky, hairy stems. Around each node on the stem, a membranous sheath (ocreae) is formed. The puffed-up nodes appear red in color.
Green
Red/Burgundy
Smooth (glabrous)
Zig Zags
Whole Plant Traits
Native Plant
Weed
Wildflower
Herb
Erect
Dense
Medium
Cultural Conditions
Full sun (6 or more hours of direct sunlight a day)
Moist
Occasionally Wet
Coastal
Mountains
Piedmont
4a
4b
5b
5a
6a
6b
7a
7b
8b
8a
3a
3b
9a
9b
10a
10b
Clay
Loam (Silt)
Sand
Landscape
Rock Garden
Native Garden
Woodland
Naturalized Area
Rock Wall

Persicaria pensylvanica Attributes

Persicaria pensylvanica: Country Or Region Of Origin

North America, Cuba to Hispaniola

Persicaria pensylvanica: Wildlife Value

Seeds are eaten by songbirds and waterfowl. Also used for nesting.

Persicaria pensylvanica: Life Cycle

Annual
Biennial
Bulb
Perennial
Woody

Persicaria pensylvanica: Recommended Propagation Strategy

Division
Grafting
Layering
Leaf Cutting
Root Cutting
Seed
Stem Cutting

Persicaria pensylvanica: Play Value

Attractive Flowers
Attracts Pollinators
Buffer
Colorful
Defines Paths
Easy to Grow
Edible fruit
Fragrance
Pieces Used in Games
Screening
Shade
Sound
Textural
Wildlife Cover/Habitat
Wildlife Food Source
Wildlife Larval Host
Wildlife Nesting
Wind Break
Wind Shimmer

Persicaria pensylvanica: Fire Risk Rating

extreme flammability
high flammability
low flammability
medium flammability

Persicaria pensylvanica Flowers

Persicaria pensylvanica: Flower Description

1" to 2" dense spike of small rose-pink flowers

Persicaria pensylvanica: Flower Color

filter_vintage
Pink
filter_vintage
Red/Burgundy

Persicaria pensylvanica: Flower Inflorescence

Catkin
Corymb
Cyme
Head
Insignificant
Panicle
Raceme
Solitary
Spadix
Spike
Umbel

Persicaria pensylvanica: Flower Value To Gardener

Edible
Fragrant
Good Cut
Good Dried
Long Bloom Season
Long-lasting
Showy

Persicaria pensylvanica: Flower Bloom Time

Winter
Spring
Summer
Fall

Persicaria pensylvanica: Flower Petals

2-3 rays/petals
4-5 petals/rays
6 petals/rays
7 - 20 petals/rays
asymmetrical petals
Bracts
Colored Sepals
fused petals
more than 20 petals/rays
Tepals

Persicaria pensylvanica: Flower Size

1-3 inches
3-6 inches
< 1 inch
> 6 inches

Persicaria pensylvanica Leaves

Persicaria pensylvanica: Leaf Description

4" to 6" shiny leaves, sheaths without fringes, reddish joints. Some plants have small, wicked barbs on slender stems, thickened at the nodes. Tiny hairs on the margins.

Persicaria pensylvanica: Leaf Color

spa
Green

Persicaria pensylvanica: Leaf Arrangement

Alternate
Opposite
Other/more complex
Rosulate
Whorled

Persicaria pensylvanica: Leaf Shape

Acicular
Auriculate
Cordate
Cuneate
Deltoid
Elliptical
Filiform
Lanceolate
Linear
Oblanceolate
Oblong
Obovate
Obtuse
Orbicular
Ovate
Palmasect
Palmatifid
Peltate
Pinnatifid
Pinnatisect
Reniform
Rhomboidal
Spatulate
Subcordate
Subulate

Persicaria pensylvanica: Hairs Present

No
Yes

Persicaria pensylvanica: Leaf Length

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Persicaria pensylvanica: Leaf Feel

Fleshy
Glossy
Leathery
Papery
Prickly
Rough
Rubbery
Slippery
Smooth
Soft
Velvety
Waxy

Persicaria pensylvanica: Leaf Width

< 1 inch
1-3 inches
3-6 inches
> 6 inches

Persicaria pensylvanica Stem

Persicaria pensylvanica: Stem Description

Upright, sticky, hairy stems. Around each node on the stem, a membranous sheath (ocreae) is formed. The puffed-up nodes appear red in color.

Persicaria pensylvanica: Stem Color

grass
Green
grass
Red/Burgundy

Persicaria pensylvanica: Stem Is Aromatic

No
Yes

Persicaria pensylvanica: Stem Surface

Corky Ridges
Covered with a powdery bloom (glaucous)
Dull
Hairy (pubescent)
Polished
Smooth (glabrous)

Persicaria pensylvanica: Stem Form

Straight
Zig Zags

Persicaria pensylvanica Whole Plant Traits

Persicaria pensylvanica: Plant Type

Annual
Bulb
Carnivorous
Edible
Epiphyte
Fern
Ground Cover
Herb
Herbaceous Perennial
Houseplant
Mushroom
Native Plant
Ornamental Grasses and Sedges
Perennial
Poisonous
Rose
Shrub
Succulent
Tree
Turfgrass
Vegetable
Vine
Water Plant
Weed
Wildflower

Persicaria pensylvanica: Habit/Form

Arching
Ascending
Broad
Cascading
Climbing
Clumping
Columnar
Conical
Creeping
Dense
Erect
Horizontal
Irregular
Mounding
Multi-stemmed
Multi-trunked
Open
Oval
Prostrate
Pyramidal
Rounded
Spreading
Vase
Weeping

Persicaria pensylvanica: Growth Rate

Slow
Medium
Rapid

Persicaria pensylvanica: Texture

Fine
Medium
Coarse

Persicaria pensylvanica Cultural Conditions

Persicaria pensylvanica: Light

Dappled Sunlight (Shade through upper canopy all day)
Deep shade (Less than 2 hours to no direct sunlight)
Full sun (6 or more hours of direct sunlight a day)
Partial Shade (Direct sunlight only part of the day, 2-6 hours)

Persicaria pensylvanica: Soil Drainage

Frequent Standing Water
Good Drainage
Moist
Occasional Flooding
Occasionally Dry
Occasionally Wet
Very Dry

Persicaria pensylvanica: NC Region

Coastal
Mountains
Piedmont

Persicaria pensylvanica: USDA Plant Hardiness Zone

thermostat
10a
thermostat
10b
thermostat
3a
thermostat
3b
thermostat
4a
thermostat
4b
thermostat
5a
thermostat
5b
thermostat
6a
thermostat
6b
thermostat
7a
thermostat
7b
thermostat
8a
thermostat
8b
thermostat
9a
thermostat
9b

Persicaria pensylvanica: Soil Texture

Clay
High Organic Matter
Loam (Silt)
Sand
Shallow Rocky

Persicaria pensylvanica Landscape

Persicaria pensylvanica: Landscape Theme

Asian Garden
Butterfly Garden
Children's Garden
Cottage Garden
Cutting Garden
Drought Tolerant Garden
Edible Garden
English Garden
Fairy Garden
Garden for the Blind
Native Garden
Nighttime Garden
Pollinator Garden
Rain Garden
Rock Garden
Shade Garden
Water Garden
Winter Garden

Persicaria pensylvanica: Design Feature

Accent
Barrier
Border
Flowering Tree
Foundation Planting
Hedge
Mass Planting
Screen/Privacy
Security
Shade Tree
Small groups
Small Tree
Specimen
Street Tree
Understory Tree

Persicaria pensylvanica: Landscape Location

Coastal
Container
Hanging Baskets
Houseplants
Lawn
Meadow
Naturalized Area
Near Septic
Patio
Pond
Pool/Hardscape
Recreational Play Area
Riparian
Rock Wall
Slope/Bank
Small Space
Vertical Spaces
Walkways
Woodland